Institutional Revolutionary Party
The Institutional Revolutionary Party (, PRI) is a Mexican political party founded in 1929 that held uninterrupted power in the country for 71 years from 1929 to 2000, first as the National Revolutionary Party (, PNR), then as the Party of the Mexican Revolution (, PRM), and finally renaming itself as the Institutional Revolutionary Party in 1946.
Federation of Parties of the Mexican People
The party was founded by Genovevo de la O, a former Zapatista commander, in 1945. The FPPM drew most of its support from left wing academics and soldiers that had grown disillusioned with the almost omnipotent Institutional Revolutionary Party (PRI), and believed the PRI no longer represented the ideas of the Mexican Revolution. Notable members of the FPPM were Marcelino García Barragán, Rubén Jaramillo, Francisco J. Múgica, José C. Valadés and Miguel Henríquez Guzmán. Most of them had been supporters of Emiliano Zapata and revolucionary leaders , and the FPPM was notable for being the last split from the PRI that included leaders who had participated in the Mexican Revolution.