Jorge José Ricardo Masetti Blanco, also known as "Commander Segundo", was an Argentinean journalist and guerrilla leader. Born in Avellaneda, Masetti entered the jungle at Salta and after 21 April 1964 was not heard from again. He was the founder and the first director of the Cuban news agency Prensa Latina, and became the leader of one of Argentina's first guerrilla organizations, the Guevarist People's Guerrilla Army.

Rodolfo Jorge Walsh was an Argentine writer and journalist of Irish descent, considered the founder of investigative journalism in Argentina. He is most famous for his Open Letter from a Writer to the Military Junta, which he published the day before his murder, protesting that Argentina's last civil-military dictatorship's economic policies were having an even greater and disastrous effect on ordinary Argentines than its widespread human rights abuses.