Nicos Poulantzas (Greek: Νίκος Πουλαντζάς; 21 September 1936, Athens, Greece – 3 October 1979, Paris, France) was a Greek Marxist political sociologist. In the 1970s, Poulantzas was known, along with Louis Althusser, as a leading Structural Marxist and, while at first a Leninist, eventually became a proponent of eurocommunism. He is most well known for his theoretical work on the state. But he also offered Marxist contributions to the analysis of fascism, social class in the contemporary world, and the collapse of the dictatorships in Southern Europe in the 1970s (e.g. Franco's rule in Spain, Salazar's in Portugal, and Papadopoulos's in Greece).

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