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TheWorkers' and Peasants' Bloc (Spanish:Bloque Obrero y Campesino,BOC;Catalan:Bloc Obrer i Camperol, BOC) was a "Right Opposition"communist group inSpain, centered inCatalonia.

BOC was founded inBarcelona in 1931, as the mass front of theCatalan-Balearic Communist Federation (FCCB), after the merger of theCatalan Communist Party into FCCB. FCCB, which made up the nucleus of BOC, later changed its name to Iberian Communist Federation, thus stating its intention to expand itself and BOC throughoutSpain. Prominent leaders of BOC wereJoaquín Maurín,Hilari Arlandis,Jordi Arquer,Pere Bonet,Víctor Colomer,Abelard Tona Nadalmai andÀngel Estivill. In November 1935, the majority of BOC merged with theTrotskyistCommunist Left of Spain (ICE) to form theWorkers' Party of Marxist Unification (POUM; Catalan:Partit Obrer d'Unificació Marxista).^[1] The minority stayed out of the merger and later joined theUnified Socialist Party of Catalonia (PSUC).

The central publication of BOC wasLa Batalla. BOC also publishedL'Hora andEl Front inBarcelona,L'Espurna inGirona andAvant inLleida.

• Political parties established in 1931
• Communist parties in Spain
• Political parties disestablished in 1935
• POUM
• Right Opposition
• 1931 establishments in Catalonia

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