Born in the city of Tres Arroyos, he was the son of a notable metalworkers' union leader, Armando Cabo.
Dardo Cabo started political activism in the Movimiento Nacionalista Tacuara (MNT), a far-right youth group of the 1960s.
Just like several other members of the MNT, he progressively embraced Peronism, and created in 1961 the Movimiento Nueva Argentina, a Peronist right-wing organization.
Dardo Cabo came to be famous when he hijacked, together with other militants, an Aerolíneas Argentinas' plane on September 28, 1966, and diverted it towards the Malvina Islands [Falkland Islands], where he planted the Argentinian flag, during the so-called 1966 Aerolineas Argentinas DC-4 hijacking Operation Condor.
He was then arrested during the brutal of the military junta commanded by dictator Jorge Rafael Videla's [National Reorganization Processjunta], because of his political activities, and finally executed in 1977 alongside Roberto Rufino Pirles and other five prisoners.