[5] The new party claimed to represent the original political line of PPS formulated by Vicente Lombardo Toledano.
[6] The group that had formed the trade union centre UGOCM-Roja joined PPM.
The declaration called for the formation of a united Marxist-Leninist party of the working class in Mexico.
[8] Ahead of the 1979 elections, PPM joined the Left-wing Coalition led by the Mexican Communist Party.
[1] However, in January 1985 a faction of former PPM members Led by Alejandro Gascón Mercado broke away from PSUM.