Question: Operation Gardel was the codename given by the Peronist guerrilla organization Montoneros to the downing of a Lockheed C-130 Hercules, carrying 114 Gendarmerie personnel as part of the Operativo Independencia, was the code-name of the Argentine military operation in the Tucumán Province, started in what year, to crush the ERP —"Ejército Revolucionario del Pueblo" or "People's Revolutionary Army"—, a Guevarist guerrilla group?
Sentence (from "Dirty War"): The "disappeared" included those thought to be a political or ideological threat to the military junta, even vaguely, and they were killed in an attempt by the junta to silence the opposition and break the determination of the guerrillas.
Relevant evidence: No