Parties in the Spanish Revolution (1936–1939)

The Spanish Civil War pitted two broad coalitions:

Republican / Left-Wing Alliance

• PSOE – Spanish Socialist Workers' Party.
• UGT – General Union of Workers (socialist union).
• CNT-FAI – National Confederation of Labor / Iberian Anarchist Federation (anarcho-syndicalists).
• PCE – Communist Party of Spain (Soviet-aligned).
• POUM – Workers' Party of Marxist Unification (anti-Stalinist Marxist).
• IR, UR, ERC – Republican Left, Republican Union, Catalan Left (regionalist republicans).

Nationalist / Right-Wing Alliance

• CEDA – Spanish Confederation of Autonomous Right (Catholic conservative).
• Comunión Tradicionalista – Carlists (monarchist, ultra-Catholic).
• Falange Española – Fascist party (merged 1937 into FET y de las JONS).
• Military conspirators – Generals Mola, Franco, Sanjurjo.

International involvement: USSR/International Brigades (Republic); Germany/Italy (Nationalists).