Margarita Belén is a town in Chaco Province, Argentina. It is the head town of the

Primero de Mayo Department Primero de Mayo is a south eastern department of Chaco Province in Argentina. The provincial subdivision has a population of about 9,000 inhabitants in an area of 1,864 km2, and its capital city is Margarita Belén, which is located around ...

. The town became infamous when on 13 December 1976, a joint operation of the Argentine Army and the Chaco Provincial Police resulted in the Massacre of Margarita Belén during the so-called

National Reorganization Process The National Reorganization Process (Spanish: ''Proceso de Reorganización Nacional'', often simply ''el Proceso'', "the Process") was the military dictatorship that ruled Argentina from 1976 to 1983, in which it was supported by the United Sta ...

. The operation resulted in the torture and execution of 22 political prisoners.

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Populated places in Chaco Province Populated places established in 1890 {{ChacoAR-geo-stub