5th Column
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A fifth column is any group of people who undermine a larger group or nation from within, usually in favor of an enemy group or another nation. According to
Harris Mylonas Harris Mylonas is Associate Professor of Political Science and International Affairs at George Washington University and the editor-in-chief for ''Nationalities Papers'', a peer-reviewed academic journal published by Cambridge University Press. He ...
and Scott Radnitz, "fifth columns" are “domestic actors who work to undermine the national interest, in cooperation with external rivals of the state." The activities of a fifth column can be overt or clandestine. Forces gathered in secret can mobilize openly to assist an external attack. This term is also extended to organised actions by military personnel. Clandestine fifth column activities can involve acts of
sabotage Sabotage is a deliberate action aimed at weakening a polity, effort, or organization through subversion, obstruction, disruption, or destruction. One who engages in sabotage is a ''saboteur''. Saboteurs typically try to conceal their identitie ...
,
disinformation Disinformation is false information deliberately spread to deceive people. It is sometimes confused with misinformation, which is false information but is not deliberate. The English word ''disinformation'' comes from the application of the L ...
,
espionage Espionage, spying, or intelligence gathering is the act of obtaining secret or confidential information (intelligence) from non-disclosed sources or divulging of the same without the permission of the holder of the information for a tangibl ...
, and/or
terrorism Terrorism, in its broadest sense, is the use of criminal violence to provoke a state of terror or fear, mostly with the intention to achieve political or religious aims. The term is used in this regard primarily to refer to intentional violen ...
executed within defense lines by secret sympathizers with an external force.


Origin

The term "fifth column" originated in
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...
(originally ''quinta columna'') during the early phase of the
Spanish Civil War The Spanish Civil War ( es, Guerra Civil Española)) or The Revolution ( es, La Revolución, link=no) among Nationalists, the Fourth Carlist War ( es, Cuarta Guerra Carlista, link=no) among Carlists, and The Rebellion ( es, La Rebelión, lin ...
. It gained popularity in the Loyalist faction media in early October 1936 and immediately started to spread abroad. The exact origins of the term are not clear. Its first known appearance is in a secret telegram dated September 30, 1936, that was sent to
Berlin Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...
by the
German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...
chargé d'affaires A ''chargé d'affaires'' (), plural ''chargés d'affaires'', often shortened to ''chargé'' (French) and sometimes in colloquial English to ''charge-D'', is a diplomat who serves as an embassy's chief of mission in the absence of the ambassador ...
in
Alicante Alicante ( ca-valencia, Alacant) is a city and municipality in the Valencian Community, Spain. It is the capital of the province of Alicante and a historic Mediterranean port. The population of the city was 337,482 , the second-largest in t ...
, Hans Hermann Völckers. In the telegram, he referred to an unidentified "supposed statement by
Franco Franco may refer to: Name * Franco (name) * Francisco Franco (1892–1975), Spanish general and dictator of Spain from 1939 to 1975 * Franco Luambo (1938–1989), Congolese musician, the "Grand Maître" Prefix * Franco, a prefix used when ref ...
" that "is being circulated" (apparently in the
Republican Republican can refer to: Political ideology * An advocate of a republic, a type of government that is not a monarchy or dictatorship, and is usually associated with the rule of law. ** Republicanism, the ideology in support of republics or agains ...
zone or in the Republican-held
Levantine Levantine may refer to: * Anything pertaining to the Levant, the region centered around modern Syria, Lebanon, Israel, Palestine, and Jordan, including any person from the Levant ** Syria (region), corresponding to the modern countries of the Lev ...
zone), and he suggests that in that statement Franco had claimed that there were four
Nationalist Nationalism is an idea and movement that holds that the nation should be congruent with the state. As a movement, nationalism tends to promote the interests of a particular nation (as in a group of people), Smith, Anthony. ''Nationalism: The ...
columns approaching Madrid, and a fifth
column A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member. ...
waiting to attack from the inside. The telegram was part of the secret German diplomatic correspondence and was discovered long after the civil war. The first identified public use of the term is in the October 3, 1936, issue of the Madrid
Communist Communism (from Latin la, communis, lit=common, universal, label=none) is a far-left sociopolitical, philosophical, and economic ideology and current within the socialist movement whose goal is the establishment of a communist society, a s ...
daily ''
Mundo Obrero ''Mundo Obrero'' (Spanish language, Spanish: ''Workers World'') is the periodical of the Communist Party of Spain (main), Communist Party of Spain (PCE). The paper is based in Madrid, Spain. History and profile ''Mundo Obrero'' was first published ...
''. In a front-page article, the party propagandist
Dolores Ibárruri Isidora Dolores Ibárruri Gómez (; 9 December 189512 November 1989), also known as (English: "the Passionflower"), was a Spanish Republican politician of the Spanish Civil War of 1936–1939 and a communist known for her slogan ''¡No Pasará ...
referred to a statement very similar (or identical) to the one that Völckers had referred to in his telegram, but attributed it to General
Emilio Mola Emilio Mola y Vidal, 1st Duke of Mola, Grandee of Spain (9 July 1887 – 3 June 1937) was one of the three leaders of the Nationalist coup of July 1936, which started the Spanish Civil War. After the death of Sanjurjo on 20 July 1936, M ...
rather than to Franco. On the same day, the PCE activist Domingo Girón made a similar claim during a public rally. During the next few days, various Republican papers repeated the story, but with differing detail; some attributed the phrase to General Queipo de Llano. By mid-October, the media was already warning of the "famous fifth column". Historians have never identified the original statement referred to by Völckers, Ibárruri, Girón, de Jong, and others. The transcripts of
Francisco Franco Francisco Franco Bahamonde (; 4 December 1892 – 20 November 1975) was a Spanish general who led the Nationalist faction (Spanish Civil War), Nationalist forces in overthrowing the Second Spanish Republic during the Spanish Civil War ...
's,
Gonzalo Queipo de Llano Gonzalo Queipo de Llano y Sierra (5 February 1875 – 9 March 1951) was a Spanish military leader who rose to prominence during the July 1936 coup and then the Spanish Civil War and the White Terror. Biography A career army man, Queipo de Llan ...
's, and
Emilio Mola Emilio Mola y Vidal, 1st Duke of Mola, Grandee of Spain (9 July 1887 – 3 June 1937) was one of the three leaders of the Nationalist coup of July 1936, which started the Spanish Civil War. After the death of Sanjurjo on 20 July 1936, M ...
's radio addresses have been published, but they do not contain the term, and no other original statement containing this phrase has ever surfaced. A British journalist who took part in Mola's press conference on October 28, 1936, claimed that Mola referred to ''quinta columna'' on that day, but by that time the term had already been being used in the Republican press for more than three weeks.
Historiographic Historiography is the study of the methods of historians in developing history as an academic discipline, and by extension is any body of historical work on a particular subject. The historiography of a specific topic covers how historians hav ...
works offer differing perspectives on authorship of the term. Many scholars have no doubt about Mola's role and refer to "fifth column" as "a term coined in 1936 by General Emilio Mola", though they acknowledge that his exact statement cannot be verified. In some sources, Mola is named as a person who had used the term during an impromptu press interview, and different - though detailed - versions of the exchange are offered. Probably the most popular version describes the theory of Mola's authorship with a grade of doubt, either noting that it is presumed but has never been proven, or that the phrase "is attributed" to Mola, who "apparently claimed" so, or else noting that "la famosa quinta columna a la que parece que se había referido el general Mola" (the famous fifth column that General Mola seems to have referred to) Some authors consider it possible if not likely that the term has been invented by the Communist propaganda with the purpose of either raising morale or providing justification for terror and repression; initially it might have been part of the
whispering campaign A whispering campaign or whisper campaign is a method of persuasion in which damaging rumors or innuendo are spread about the target, while the source of the rumors seeks to avoid being detected while they are spread. For example, a political camp ...
, but was later openly floated by Communist propagandists. There are also other theories afloat. Some writers, mindful of the origin of the phrase, use it only in reference to military operations rather than the broader and less well-defined range of activities that sympathizers might engage in to support an anticipated attack.


Second World War

By the late 1930s, as American involvement in the war in Europe became more likely, the term "fifth column" was commonly used to warn of potential
sedition Sedition is overt conduct, such as speech and organization, that tends toward rebellion against the established order. Sedition often includes subversion of a constitution and incitement of discontent toward, or insurrection against, estab ...
and disloyalty within the borders of the United States. The fear of betrayal was heightened by the rapid
fall of France The Battle of France (french: bataille de France) (10 May – 25 June 1940), also known as the Western Campaign ('), the French Campaign (german: Frankreichfeldzug, ) and the Fall of France, was the German invasion of France during the Second World ...
in 1940, which some blamed on internal weakness and a pro-German "fifth column". A series of photos run in the June 1940 issue of ''
Life Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from that which does not, and is defined by the capacity for growth, reaction to stimuli, metabolism, energ ...
'' magazine warned of "signs of Nazi Fifth Column Everywhere". In a speech to the
House of Commons The House of Commons is the name for the elected lower house of the bicameral parliaments of the United Kingdom and Canada. In both of these countries, the Commons holds much more legislative power than the nominally upper house of parliament. ...
that same month,
Winston Churchill Sir Winston Leonard Spencer Churchill (30 November 187424 January 1965) was a British statesman, soldier, and writer who served as Prime Minister of the United Kingdom twice, from 1940 to 1945 Winston Churchill in the Second World War, dur ...
reassured MPs that "Parliament has given us the powers to put down Fifth Column activities with a strong hand." In July 1940, ''
Time Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to ...
'' magazine referred to talk of a fifth column as a "national phenomenon". In August 1940, ''
The New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid ...
'' mentioned "the first spasm of fear engendered by the success of fifth columns in less fortunate countries". One report identified participants in Nazi "fifth columns" as "partisans of authoritarian government everywhere", citing
Poland Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populous ...
,
Czechoslovakia , rue, Чеськословеньско, , yi, טשעכאסלאוואקיי, , common_name = Czechoslovakia , life_span = 1918–19391945–1992 , p1 = Austria-Hungary , image_p1 ...
,
Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
, and the
Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...
. During the Nazi invasion of Norway, the head of the Norwegian fascist party, Vidkun Quisling, proclaimed the formation of a new fascist government in control of Norway, with himself as Prime Minister, by the end of the first day of fighting. The word "quisling" soon became a byword for "collaborator" or "traitor". ''The New York Times'' on August 11, 1940, featured three editorial cartoons using the term. John Langdon-Davies, a British journalist who covered the Spanish Civil War, wrote an account called ''The Fifth Column'' which was published the same year. In November 1940, Ralph Thomson, reviewing Harold Lavine's ''Fifth Column in America,'' a study of Communist and fascist groups in the U.S., in ''The New York Times,'' questioned his choice of that title: "the phrase has been worked so hard that it no longer means much of anything." Immediately following the Japanese attack on Pearl Harbor, U.S. Secretary of the Navy Frank Knox issued a statement that "the most effective Fifth Column work of the entire war was done in Hawaii with the exception of Norway." In a column published in '' The Washington Post'', dated 12 February 1942, the columnist Walter Lippmann wrote of imminent danger from actions that might be taken by
Japanese American are Americans of Japanese ancestry. Japanese Americans were among the three largest Asian American ethnic communities during the 20th century; but, according to the 2000 census, they have declined in number to constitute the sixth largest Asi ...
s. Titled "The Fifth Column on the Coast", he wrote of possible attacks that could be made along the West Coast of the United States that would amplify damage inflicted by a potential attack by Japanese naval and air forces. Suspicion about an active fifth column on the coast led eventually to the internment of Japanese Americans. During the Japanese invasion of the Philippines, an article in the '' Pittsburgh Post-Gazette'' in December 1941 said the indigenous Moro Muslims were "capable of dealing with Japanese fifth columnists and invaders alike". Another in the '' Vancouver Sun'' the following month described how the large population of Japanese immigrants in Davao in the Philippines welcomed the invasion: "the first assault on Davao was aided by numbers of Fifth Columnists–residents of the town".


Later usage

* German minority organizations in
Czechoslovakia , rue, Чеськословеньско, , yi, טשעכאסלאוואקיי, , common_name = Czechoslovakia , life_span = 1918–19391945–1992 , p1 = Austria-Hungary , image_p1 ...
formed the Sudeten German Free Corps, which aided Nazi Germany. Some claimed they were "self-defense formations" created in the aftermath of World War I and unrelated to the German invasion two decades later. More often their origins were discounted and they were defined by the role they played in 1938–39: "The same pattern was repeated in Czechoslovakia.
Henlein Heinlein or Henlein is a German surname. Notable people with the surname include: * Karl Heinlein (1892–1960), Austrian former footballer * Klaus Heinlein (born 1953), German former footballer * Konrad Henlein (1898–1945), Nazi German politici ...
's Free Corps played in that country the part of fifth column". * In 1945, a document produced by the
U.S. Department of State The United States Department of State (DOS), or State Department, is an United States federal executive departments, executive department of the Federal government of the United States, U.S. federal government responsible for the country's fore ...
compared the earlier efforts of Nazi Germany to mobilize the support of sympathizers in foreign nations to the superior efforts of the international communist movement at the end of World War II: "a communist party was in fact a fifth column as much as any
erman Erman Rašiti may refer to: Given name * Erman Bulucu (born 1989), Turkish footballer * Erman Eltemur (born 1993), Turkish karateka * Erman Güraçar (born 1974), Turkish footballer * Erman Kılıç (born 1983), Turkish footballer * Erman Kunter (b ...
Bund group, except that the latter were crude and ineffective in comparison with the Communists".
Arthur M. Schlesinger Jr. Arthur Meier Schlesinger Jr. (; born Arthur Bancroft Schlesinger; October 15, 1917 – February 28, 2007) was an American historian, social critic, and public intellectual. The son of the influential historian Arthur M. Schlesinger Sr. and a spe ...
, wrote in 1949: "the special Soviet advantage—the warhead—lies in the fifth column; and the fifth column is based on the local Communist parties". * Zainichi Koreans living in
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
, particularly those affiliated with the organization
Chongryun The General Association of Korean Residents in Japan,
" ''
(which is itself affiliated with the government of North Korea) are sometimes seen as a "fifth column" by some Japanese, and have been the victims of verbal and physical attacks. These have occurred more frequently since the government of
Kim Jong Il Kim Jong-il (; ; ; born Yuri Irsenovich Kim;, 16 February 1941 – 17 December 2011) was a North Korean politician who was the second supreme leader of North Korea from 1994 to 2011. He led North Korea from the 1994 death of his father Kim ...
acknowledged it had abducted Japanese citizens from Japan and tested ballistic missiles near the waters of and over mainland Japan. * A significant number of Israeli Arabs, who compose approximately 20% of Israel's population, identify more with the
Palestinian cause Palestinian nationalism is the national movement of the Palestinian people that espouses self-determination and sovereignty over the region of Palestine.de Waart, 1994p. 223 Referencing Article 9 of ''The Palestinian National Charter of 1968' ...
than with the State of Israel or Zionism. As a result, many Israeli Jews, including politicians,
rabbi A rabbi () is a spiritual leader or religious teacher in Judaism. One becomes a rabbi by being ordained by another rabbi – known as '' semikha'' – following a course of study of Jewish history and texts such as the Talmud. The basic form o ...
s, journalists, and historians, view them (and/or the main Israeli Arab political group, the Joint List) as a fifth column. * Counter-jihad literature has sometimes portrayed Western Muslims as a "fifth column", collectively seeking to destabilize Western nations' identity and values for the benefit of an international Islamic movement intent on the establishment of a caliphate in Western countries. Following the 2015 attack by French-born Muslims on the offices of ''
Charlie Hebdo ''Charlie Hebdo'' (; meaning ''Charlie Weekly'') is a French satirical weekly magazine, featuring cartoons, reports, polemics, and jokes. Stridently non-conformist in tone, the publication has been described as Anti-racism, anti-racist, sceptica ...
'' in Paris, the leader of the UK Independence Party Nigel Farage said that Europe had "a fifth column living within our own countries". In 2001 Dutch politician Pim Fortuyn talked about Muslim immigrants being a "fifth column" the night he was dismissed as leader of
Liveable Netherlands Livable Netherlands ( nl, Leefbaar Nederland, LN) was a Dutch political party. Pim Fortuyn began his political career in the party. History Historically there have always been parties in States Provincial (provincial legislatures) and municipa ...
. * In 2022, Russian president Vladimir Putin called Russian citizens who are against the
invasion of Ukraine The territory of present-day Ukraine has been Invasion, invaded or Military occupation, occupied a number of times throughout History of Ukraine, its history. List See also *List of invasions *List of wars involving Ukraine References

...
as fifth columnists and "national traitors."


In popular culture

The title of Ernest Hemingway's only play " The Fifth Column" (1938) is a translation of General Mola's phrase, ''la quinta columna.'' In early 1937 Hemingway had been in Madrid, reporting the war from the loyalist side, and helping make the film ''
The Spanish Earth ''The Spanish Earth'' is a 1937 anti-fascist film made during the Spanish Civil War in support of the democratically elected Republicans, whose forces included a wide range from the political left like communists, socialists, anarchists, to moder ...
''. He returned to the US to publicise the film and wrote the play, in the Hotel Florida in Madrid, on his next visit to Spain later that year. In the US an Australian radio play, ''The Enemy Within'', proved to be very popular, though this popularity was due to the belief that the stories of fifth column activities were based on real events. In December 1940 the Australian censors had the series banned. British reviewers of
Agatha Christie Dame Agatha Mary Clarissa Christie, Lady Mallowan, (; 15 September 1890 – 12 January 1976) was an English writer known for her 66 detective novels and 14 short story collections, particularly those revolving around fictiona ...
's novel ''
N or M? ''N or M?'' is a work of detective fiction by Agatha Christie first published in the US by Dodd, Mead and Company in 1941 and in the UK by the Collins Crime Club in November of the same year.Chris Peers, Ralph Spurrier and Jamie Sturgeon. ''Coll ...
'' in 1941 used the term to describe the struggle of two British partisans of the Nazi regime working on its behalf in Britain during World War II. In
Frank Capra Frank Russell Capra (born Francesco Rosario Capra; May 18, 1897 – September 3, 1991) was an Italian-born American film director, producer and writer who became the creative force behind some of the major award-winning films of the 1930s ...
's film '' Meet John Doe'' (1941), newspaper editor Henry Connell warns the politically-naïve protagonist, John Doe, about a businessman's plans to promote his own political ambitions using the apolitical John Doe Clubs. Connell says to John: "Listen, pal, this fifth-column stuff is pretty rotten, isn't it?", identifying the businessman with anti-democratic interests in the United States. When Doe agrees, he adds: "And you'd feel like an awful sucker if you found yourself marching right in the middle of it, wouldn't you?"
Alfred Hitchcock Sir Alfred Joseph Hitchcock (13 August 1899 – 29 April 1980) was an English filmmaker. He is widely regarded as one of the most influential figures in the history of cinema. In a career spanning six decades, he directed over 50 featur ...
's '' Saboteur'' (1942) features Robert Cummings asking for help against "fifth columnists" conspiring to sabotage the American war effort. Soon the term was being used in popular entertainment. Several World War II era animated shorts include the term. Cartoons of
Porky Pig Porky Pig is an animated character in the Warner Bros. ''Looney Tunes'' and ''Merrie Melodies'' series of cartoons. He was the first character created by the studio to draw audiences based on his celebrity, star power, and the animators created ma ...
asked any "fifth columnists" in the audience to leave the theater immediately. In
Looney Tunes ''Looney Tunes'' is an American Animated cartoon, animated comedy short film series produced by Warner Bros. starting from 1930 to 1969, concurrently with its partner series ''Merrie Melodies'', during the golden age of American animation.
' ''Foney Fables'', the narrator of a comic fairy tale described a wolf in sheep's clothing as a "fifth columnist". There was a
Merrie Melodies ''Merrie Melodies'' is an American animation, animated series of comedy short films produced by Warner Bros. starting in 1931, during the golden age of American animation, and ending in 1969. Then some new cartoons were produced from the late 197 ...
cartoon released in 1943 titled ''
The Fifth-Column Mouse ''The Fifth-Column Mouse'' is a 1943 Warner Bros. ''Merrie Melodies'' animated cartoon directed by Friz Freleng. The short was released on March 6, 1943. The cartoon features a band of mice who engage in war against a cat. This is a wartime prop ...
.'' Comic books also contained references to the fifth column. Graham Greene, in ''
The Quiet American ''The Quiet American'' is a 1955 novel by English author Graham Greene. Narrated in the first person by journalist Thomas Fowler, the novel depicts the breakdown of French colonialism in Vietnam and early American involvement in the Vietnam W ...
'' (1955) uses the phrase "Fifth Column, Third Force, Seventh Day" in the second chapter. In the 1959 British action film '' Operation Amsterdam'', the term "fifth columnists" is used repeatedly to refer to Nazi sympathizing members of the Dutch Army. The V franchise is a set of TV shows, novels and comics about an alien invasion of Earth. A group of aliens opposed to the invasion and assist the human Resistance Movement is called The Fifth Column. In the episode "Flight Into the Future" from the 1960s TV show '' Lost In Space'', Dr. Smith was referred to as the fifth columnist of the Jupiter 2 expedition. In the first episode, he was a secret agent sent to sabotage the mission who got caught on board at liftoff. There is an American weekly news podcast called "The Fifth Column", hosted by Kmele Foster,
Matt Welch Matthew Lee Welch (born July 31, 1968) is an American blogger, journalist, author, and libertarian political pundit. Early life Welch was born on July 31, 1968 in Bellflower, California. He was raised in Long Beach, California. He attended UC ...
, Michael C. Moynihan, and Anthony Fisher. Robert A. Heinlein's 1941 story "The Day After Tomorrow", originally titled "
Sixth Column ''Sixth Column'', also known under the title ''The Day After Tomorrow'', is a science fiction novel by American writer Robert A. Heinlein, based on a then-unpublished story by editor John W. Campbell, and set in a United States that has been conq ...
", refers to a fictional fifth column that In '' Foyle's War'', Series 2 Episode 3, "War Games", one line reads, "It's the Second salvage collection I've missed, they've got me down as a fifth columnist."


See also

* Alien infiltration * Black propaganda *
Copperhead (politics) In the 1860s, the Copperheads, also known as Peace Democrats, were a faction of Democrats in the Union who opposed the American Civil War and wanted an immediate peace settlement with the Confederates. Republicans started calling anti-war De ...
* Demographic threat * Entryism *
False flag A false flag operation is an act committed with the intent of disguising the actual source of responsibility and pinning blame on another party. The term "false flag" originated in the 16th century as an expression meaning an intentional misr ...
*
Front organization A front organization is any entity set up by and controlled by another organization, such as intelligence agencies, organized crime groups, terrorist organizations, secret societies, banned organizations, religious or political groups, advocacy gro ...
*
Internal enemy Internal enemy refers to individuals or groups within one country who are perceived as a threat to that country. The distinction between internal and external enemies is discussed in Plato's ''Republic''. Groups considered internal enemies by the c ...
* Jash (term) * Quisling * Sleeper cell * Stay-behind


Notes


References


Further reading

* * * * * Britt G. ''The Fifth column is Here'' / George Britt. New York: Wilfred Funk, Inc.,1940 125 p. * Lavine H. ''Fifth column in America'' / Harold Lavine (1915-). New York: Doubleday, Doran, Incorporated, 1940 240 pp. {{Authority control 1936 introductions 1930s in Madrid 1936 in Spain Articles containing video clips Deep politics Intelligence operations by type Irregular military Psychological warfare techniques Spanish Civil War Urban guerrilla warfare tactics