Libcom.org's reading guide on the Spanish civil war and social revolution from 1936-1939 which, sparked by a military rising lead by right-wing General Franco, was arguably the most far-reaching revolution in history.
The CNT in the Spanish Revolution - Jose Peirats - Extensive, three volume work by chronicling the history of the Confederación Nacional del Trabajo (CNT - "National Confederation of Labour"), the anarcho-syndicalist union and largest workers' union in Spain at the time during the Spanish civil war and revolution 1936-9.
CNT - Confederación Nacional del Trabajo, an anarcho-syndicalist union founded in 1910 which during the civil war boasted 1.5 million members and was easily its most influential organisation.
FAI - Federación Anarquista Ibérica, an anarchist political organisation active both within and out of the CNT.
Friends of Durruti - Anarchist group founded during the civil war opposing the CNT's participation in the Republican government.
Mujeres Libres - Anarcho-syndicalist women's organisation active within the Spanish CNT before and during the Spanish revolution.
POUM - Partido Obrero de Unificación Marxista, an anti-Stalinist communist political party which was severely repressed by the Spanish Communist Party. George Orwell served as a member of one of their militias.
Buenaventura Durruti - Legendary anarcho-syndicalist rail worker, CNT member and military leader, killed during the Spanish civil war.
Spilling the Spanish beans - George Orwell - 1937 essay on the lies in the British press obscuring the revolutionary character of events in Spain in favour of a simple story of 'democracy vs. fascism'.
Was there a Spanish revolution? - Enric Mompo - Essay on the nature of the Spanish civil war summarizing the historical background of the military uprising and that immediately after, spontaneously formed committees and workers patrols replaced the state throughout most of Spain, providing “irrefutable proof of the socialist character of the Spanish Revolution”.
The Friends of Durruti Group: 1937-39 - Agustin Guilamòn - In-depth study of the hugely important anarcho-syndicalist CNT militants who opposed their union's collaboration with the Republican government during the Spanish Civil War.
Story of the Iron Column: militant anarchism in the Spanish civil war - Abel Paz - History of the legendary Column who fought fascism and resisted attempts to turn them into a regular military outfit.
The Foreign Legion of the Revolution - Interesting article focusing on the activity of exiled German anarcho-syndicalists in Spain, both in the lead up to and during the Civil War and Revolution of 1936.
Living Utopia - A unique feature-length documentary chronicling the origins and evolution of the Spanish anarchist movement and its important role during the Spanish revolution. In Spanish with English subtitles.
Land and Freedom - Ken Loach's 1995 film of an unemployed Communist who leaves Britain to fight in the Spanish civil war.
For Whom the Bell Tolls - Ernest Hemingway - Novel of a young American who goes to Spain to fight for the International Brigades. The book shows Hemingway's obvious bias in favour of the Stalinist Communist Party version of events but is still an excellent read.