The Communist Youth Union of Spain (Spanish: Unión de Juventudes Comunistas de España, UJCE; also simply the Communist Youth) is the youth organisation of the Communist Party of Spain (PCE). The UJCE merged with the Federation of the Socialist Youth of Spain (FJS) to form the Juventudes Socialistas Unificadas (JSU) in 1936, following the policy lines friendly to the concept of popular front established in the 7th World Congress of the Comintern. It was formally reconstituted under the UJCE name in 1961. As the PCE, the UJCE is a founding member of United Left.