The Workers' Party of Marxist Unification (POUM) was a left-wing Trotskyist organisation formed by Andreu Nin in 1935 to oppose Stalinist communism in Spain. POUM militias fought on the side of the Republicans during the Spanish Civil War (1936-39) but quickly became involved in faction fighting with the Communist Party of Spain (PCE). The resulting victory of the PCE led to the suppression of the POUM movement. George Orwell, a member of the POUM, witnessed the suppression which helped to influence many of his anti-authoritarian writings.