The ''Spilka'' (Ukrainian Social-Democratic Union) arose late in 1904 having broken away from the

Revolutionary Ukrainian Party The Revolutionary Ukrainian Party ( uk, Революційна Партія України) was a Ukrainian political party in the Russian Empire founded on 11 February 1900 by the Kharkiv student secret society Hromada. History The rise of the ...

. It entered the

Russian Social Democratic Labour Party The Russian Social Democratic Labour Party (RSDLP; in , ''Rossiyskaya sotsial-demokraticheskaya rabochaya partiya (RSDRP)''), also known as the Russian Social Democratic Workers' Party or the Russian Social Democratic Party, was a socialist pol ...

as an autonomous regional organisation. In the inner-Party struggle of the R.S.D.L.P. it sided with the

Mensheviks The Mensheviks (russian: меньшевики́, from меньшинство 'minority') were one of the three dominant factions in the Russian socialist movement, the others being the Bolsheviks and Socialist Revolutionaries. The factions eme ...

. It broke up in the period of reaction. In 1912 there were only small disconnected groups of the Spilka and by then most of its members had turned nationalists. Trotsky's ''Pravda'' (Vienna) was published as an organ of the ''Spilka'' in October and December 1908 (the first two issues).Lenin: The Present Situation in the R.S.D.L.P
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References

Defunct socialist parties in Ukraine Russian Social Democratic Labour Party {{Ukraine-party-stub