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Andreu Nin (1892-1937) was the leader of the pro-Trotskyist POUM (Unified Marxist Workers Party) which was founded after a merger of Izquierda Communista and Bloc Obrer Camperol (worker and Peasant Bloc), led by Joaquin Maurin. He also acted as Trotsky's personal secretary for a certain time. At the outbreak of the Spanish Civil War, Nin was killed by Stalinist agents.