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.
Workers' Revolutionary Party (Mexico)
The Workers' Revolutionary Party (, PRT) was a Trotskyist political party in Mexico. It was founded in 1976 by the merger of two Trotskyist groups: the International Communist League, associated with the United Secretariat of the Fourth International and the Mexican Morenists.