The Laborist Party of Mexico (PLM) was a social democratic political party in Mexico that was active from 1919 to 1940. The party was founded by Luis Napoleon Morones as the political branch of CROM, the country's most powerful labor union, and it became the most powerful party in Mexico during the 1920s; it was rivals with the Liberal Constitutionalist Party, the National Cooperativist Party, the Anti-Reelectionist Party, the Mexican Communist Party, and the Southeast Socialist Party. Presidents Alvaro Obregon (1920-24) and Plutarco Elias Calles (1924-28) were elected on a PLM ticket, but the party's power declined after Obregon's assassination in 1928. In 1929, Calles founded the National Revolutionary Party of Mexico as the new "official" party, and the PLM last participated in elections in 1940, when it sided with right-wing candidate Juan Andreu.
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