The Derg overthrew Change_of_leadership the Ethiopian Empire and Emperor Haile Selassie in a coup d'état on 12 September 1974 , establishing Creating Ethiopia as a Marxist-Leninist communist state with itself as a military junta and provisional government .

It was also the last removal of a Marxist-Leninist government in a Warsaw Pact country during the events of 1989 , and the only one that violently overthrew Change_of_leadership a country 's government and executed its leader .