Unified Socialist Party of Mexico

The Unified Socialist Party of Mexico was a socialist political party in Mexico. It later became the Mexican Socialist Party in 1988.

History

The PSUM was founded in November 1981 by the merger of four socialist parties:

The Mexican Communist Party - the Mexican affiliate of the Communist International, formed in 1919;
The Movement of Socialist Action and Unity - a split from the PCM that was active in the Mexican Labour movement;
The Party of the Mexican People - a split from the Popular Socialist Party ;
The Movement of Popular Action - a party involved in campaigns for trade-union democracy and reform in the 1970s.

Before merging to form the PSUM, these four parties had formed an electoral alliance called the Coalition of the Left in 1977.
Though the PSUM was a multi-tendency organization, it generally followed the ideology of Eurocommunism. In 1988, the PSUM changed its name to the Mexican Socialist Party after the merging with Mexican Workers' Party. In 1989, following the presidential campaign of Cuauhtémoc Cárdenas, the PMS joined Cárdenas and other dissidents from the Institutional Revolutionary Party to form the Party of the Democratic Revolution.