Lanusse became president of Argentina in 1971 . During his administration he established diplomatic relations with China and continuously faced political unrest , with an increase in guerrilla activity . Many political opponents were jailed , and Lanusse decided to negotiate with the Montoneros ( a Peronist guerrilla movement ) for the return of the corpse of Evita ( Eva Duarte de Perón ) , the legendary second wife of Juan Domingo Perón , whose body had been hidden by the " Revolución Libertadora " . On August 22 , 1971 , several imprisoned guerrillas attempted to escape from the Naval Base of Rawson in Patagonia , and were executed without trial in the Trelew massacre . In 1973 presidential elections were held , and won by Hector Cámpora
Trelew massacre
Trelew massacre
Alejandro Agustín Lanusse