The Mexican Communist Party (Spanish: Partido Comunista Mexicano, PCM) was a communist party in Mexico. It was founded in 1917 as the Socialist Workers' Party (Partido Socialista Obrero, PSO) by Manabendra Nath Roy, a left-wing Indian revolutionary. The PSO changed its name to the Mexican Communist Party in November 1919. It was outlawed in 1925 and remained illegal until 1935, during the presidency of the leftist Lázaro Cárdenas. The PCM saw in the left wing of the nationalist regime that emerged from the Mexican Revolution a progressive force to be supported—i.e. Cárdenas and his allies. In the end, the PCM disappeared after helping form the Party of the Democratic Revolution, a split from the PRI led by the son of Lázaro Cárdenas, Cuauhtémoc Cárdenas.