right, Rafael Videla did that. The Argentine Commission for Human Rights, in Geneva, charged the junta with 2,300 political murders, over 10,000 political arrests, and the disappearance of 20,000 to 30,000 people.
Videla was deposed by Field Marshal Roberto Viola, who in turn was succeeded by Lt. Gen. Leopoldo Galtieri, who then tried to invade the Falklands.
All of whom were Communists or supporters of the Monteneros. 99.9% of those folks who "disappeared" (usually into the Atlantic Ocean) got what they deserved after putting Argentina through hell in the 1960s/early 70s.
The Argentine Commission for Human Rights is a leftist organization run by the Argie equivalents of Jimmy Carter and Hillary Clinton.