He became active in leftist groups, and was assassinated in 1974 by the Triple A right-wing death squad that operated under the Isabel Perón government.

Silvio Frondizi was born in Paso de los Libres, Corrientes Province, in 1907.

[1] Frondizi founded Praxis y Movimiento de Izquierda Revolucionaria (MIR-Praxis), a left-wing revolutionary group, in 1955.

He then traveled to Cuba in support of Fidel Castro's revolution, meeting Che Guevara.

As part of his law practice during the 1960s and early 1970s, he defended the Trotskyist Workers Revolutionary Party's (PRT) political prisoners.