The Popular Socialist Party (Spanish: Partido Socialista Popular, PSP) was a communist party in Cuba. It was founded in 1925 as the Cuban Communist Party (Partido Comunista Cubano) by Blas Roca Calderio, Anibal Escalante, Fabio Grobart, Alfonso Bernal del Riesgo, and Julio Antonio Mella. Mella acted as the party's leader until his assassination in Mexico in 1929. It was later renamed the Communist Revolutionary Union (Unión Revolucionaria Comunista) in 1939. After the electoral victory of the Auténticos in the 1944 elections, the party went into decline and eventually adopted the name "Popular Socialist Party" to appeal to the electorate.