On March 24, 1976, the democratic government was toppled by a military coup. It opened one of the darkest political chapters in Argentina's history, full of repression, fear, and missing citizens. Argentine rock by no means would be immune to the military crackdown, and would suffer the worst period of censorship in its history. Rock was seen as subversive by the nation's authority figures, who began to clamp down on the music. In a 1976 speech, Admiral Emilio Massera denounced rock musicians and fans as potential subversives and repression of them began in 1977. Before the end of the decade, rock had gone increasingly underground. Rock Nacional avoided the government's heavy media censorship and allowed an outlet for codified criticism of the government.