The Unified Socialist Youth (; JSU) was a youth organization formed in the spring of 1936 in Spain through the amalgamation of the Spanish Socialist Workers' Party (PSOE) and Communist Party of Spain (PCE) youth groups. Its leader, Santiago Carrillo, came from the socialist youth, but had secretly joined the communist youth prior to the merger, and the group was soon dominated by the PCE.Beevor (2006) p. xxxv (political parties, groupings and organisations).

See also Antifascist Worker and Peasant Militias

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