section_path: History/Derg era (1974–1991)
section_name: Derg era (1974–1991)
paragraph_text: Derg era (1974–1991)
  
  Haile Selassie's rule ended on 12 September 1974, when he was deposed by the Derg, a committee made up of military and police officers. After the execution of 60 former government and military officials, the new Provisional Military Administrative Council abolished the monarchy in March 1975 and established Ethiopia as a Marxist-Leninist state. The abolition of feudalism, increased literacy, nationalization, and sweeping land reform including the resettlement and villagization from the Ethiopian Highlands became priorities.
  
  After a power struggle in 1977, Mengistu Halie Mariam gained undisputed leadership of the Derg. In 1977, Somalia, which had previously been receiving assistance and arms from the USSR, invaded Ethiopia in the Ogaden War, capturing part of the Ogaden region. Ethiopia recovered it after it began receiving massive military aid from the Soviet bloc countries. By the end of the seventies, Mengistu presided over the second-largest army in all of sub-Saharan Africa, as well as a formidable air force and navy.
  
  In 1976–78, up to 500,000 were killed as a result of the Red Terror, a violent political repression campaign by the Derg against various opposition groups. In 1987, the Derg dissolved itself and established the People's Democratic Republic of Ethiopia (PDRE) upon the adoption of the 1987 Constitution of Ethiopia. A 1983–85 famine affected around 8 million people, resulting in 1 million dead. Insurrections against authoritarian rule sprang up, particularly in the northern regions of Eritrea and Tigray. The Tigray People's Liberation Front (TPLF) merged with other ethnically based opposition movements in 1989, to form the Ethiopian People's Revolutionary Democratic Front (EPRDF).
  
  The collapse of Marxism–Leninism during the revolutions of 1989 coincided with the Soviet Union stopping aid to Ethiopia altogether in 1990. EPRDF forces advanced on Addis Ababa in May 1991, and Mengistu fled the country and was granted asylum in Zimbabwe.