Biography of Carlos Mugica (1930-1974), an Argentine priest linked to the Movement of Priests for the Third World and to the popular struggles of Argentina in the 1960s and 1970s. Most of his community work took place in Villa 31 de Retiro, which unofficially bears his name. Due to his "option for the poor," embodied in active social activism and his political independence, he received criticism from all sectors, death threats, and various attacks and assassination attempts. He was ultimately shot and killed, and the crime was attributed to the "Triple A" (Argentine Anti-Communist Alliance).