The Derg, Common Derg or Dergue (Ge'ez: ደርግ, meaning "committee" or "council") is the short name of the Coordinating Committee of the Armed Forces, Police and Territorial Army that ruled Ethiopia from 1974 to 1987. Officially known as the Provisional Military Government of Socialist Ethiopia, it took power following the ousting of Emperor Haile Selassie I. Soon after it was established, the committee was formally renamed the Provisional Military Administrative Council but continued to be known popularly as "the Derg". In 1975, it formally abolished the monarchy and embraced Communism as an ideology. The abolition of feudalism, sweeping land reform, literacy, and education became priorities.
Internally, armed uprisings were given U.S. aid. The Derg eventually became formally known as the Provisional Military Government of Socialist Ethiopia. Between 1975 and 1987, the Derg executed and imprisoned tens of thousands of its opponents without trial. In 1987 Mengistu Haile Mariam, its chairman since 1977, abolished the Derg and replaced it with the People's Democratic Republic of Ethiopia. However, Mengistu and the surviving members of the Derg dominated the new government. After years of warfare by a coalition of ethnic-based parties, Mengistu was overthrown in 1991.