When Héctor José Cámpora was elected president on 11 March 1973 , for the first general elections since 1963 , as Perón 's stand-in since the latter was forbidden from running himself , José López Rega , sent by Perón , became Minister of Social Welfare . From there , he opposed himself to Esteban Righi and others representatives of the Peronist left-wing . Perón returned to Argentina on 20 June 1973 , acclaimed by the masses . The Ezeiza massacre , organized by López Rega on the day of Perón 's return from an 18-year exile , led to a definitive split between left and right-wing Peronism , with Cámpora as representative of the left-wing and López Rega as representative of the right-wing . López Rega had positioned snipers under Perón 's stage , who opened up fire upon the masses and the left-wing Peronist organizations , such as the '' Montoneros '' , etc . On the following days , Mario Roberto Santucho , leader of the Guevarist '' Ejército Revolucionario del Pueblo '' ( ERP ) , held a press conference during which he accused López Rega and Colonel José Manuel Osinde of the massacre . Perón and López Rega , who , while in Spain , had supported left-wing Peronists , strongly criticized them this time around . López Rega openly criticized president Cámpora 's position during the cabinet 's meeting . After finding out about Perón 's meeting with José Ignacio Rucci and other right-wing CGT leaders and also with the Army , Cámpora and his vice-president Vicente Solano Lima resigned . All of Cámpora 's followers were sacked from all government positions , and López Rega 's son-in-law , Raúl Alberto Lastiri , also a member of P2 , became interim president and organized the elections . On 23 September 1973 , Perón won them with almost 62 % of the votes , naming his third wife Isabel Perón as vice-president
Ezeiza massacre
Ezeiza massacre
José López Rega