
The Workers' Party of Marxist Unification was a Spanish communist political party formed during the Second Republic and mainly active around the Spanish Civil War. It was formed by the fusion of the Trotskyist Communist Left of Spain and the Workers and Peasants' Bloc against the will of Leon Trotsky, with whom the former broke. The writer George Orwell served with the party's militia and witnessed the Stalinist repression of the movement, which would help form his anti-authoritarian ideas in later life, and motivated him to cooperate with the British Foreign Office in anti-communist propaganda activities.

Acció ('Action') was a weekly newspaper published from Tarragona, Spain 1936–1937. It was the local organ of the Iberian Communist Youth (JCI), the youth wing of POUM. The first issue was published on 1 October 1936. Ricard Garriga Salvadó was the director of Acció. When Garriga was sent to the front, Josep Vilar took over as director of the newspaper. The offices of the newspaper were located inside the POUM-JCI office in downtown Tarragona, at Rambla 14 Abril on the corner with Carrer de Girona. The newspaper was printed at Suc de Torres & Virgili.

Homage to Catalonia is George Orwell's personal account of his experiences and observations fighting for the POUM militia of the Republican army during the Spanish Civil War. The war was one of the defining events of his political outlook and a significant part of what led him to write in 1946, "Every line of serious work that I have written since 1936 has been written, directly or indirectly, against totalitarianism and for Democratic Socialism, as I understand it."

The British Independent Labour Party sent a small contingent to fight in the Spanish Civil War. The contingent fought alongside the Workers' Party of Marxist Unification (POUM) and included George Orwell, who subsequently wrote about his experiences in his personal account Homage to Catalonia.

Juventud Comunista was a weekly newspaper published from Barcelona, Spain 1936-1937. It was the central organ of the Iberian Communist Youth (JCI), the youth wing of POUM. The first issue was published on 17 September 1936. It was printed in large format, with four pages. The newspaper carried photos and caricatures. Juventud Comunista had a circulation of 15,000.

Land and Freedom is a 1995 film directed by Ken Loach and written by Jim Allen. The film narrates the story of David Carr, an unemployed worker and member of the Communist Party of Great Britain, who decides to fight in the Spanish Civil War for the republicans, an anti-rebel coalition of Socialists, Communists and Anarchists. The film won the FIPRESCI International Critics Prize and the Prize of the Ecumenical Jury at the 1995 Cannes Film Festival. The film was also nominated for the Palme d'Or at Cannes.

The Popular Front in Spain's Second Republic was an electoral alliance and pact signed in January 1936 by various left-wing political organizations, instigated by Manuel Azaña for the purpose of contesting that year's election. In Catalonia and today's Valencian Community the name of the coalition was Front d'Esquerres.