The Movement of Priests for the Third World (Spanish: Movimiento de Sacerdotes para el Tercer Mundo, MSTM) was a tendency among the Catholic Church in Argentina which aimed at combining reform ideas which followed the Second Vatican Council with a strong political and social participation. Formed mainly by priests active in villas miserias (shantytowns) and workers' neighborhoods, the Movement of Priests for the Third World was an important canal for social action between 1967 and 1976, close to Leftwing Peronism and, at times, Marxism. It was also close to the CGT de los Argentinos, which was strongly active in the 1969 Cordobazo demonstrations against Juan Carlos Onganía's military dictatorship.