Qey Shibir or Kay Shibbir (Amharic: ቀይ ሽብር ḳäy šəbbər), also known as the Ethiopian Red Terror, was a violent political repression campaign of the Derg against other competing Marxist-Leninist groups in Ethiopia and Eritrea from 1976 to 1977. The Qey Shibir was an attempt to consolidate Derg rule during the political instability after their overthrow of Emperor Haile Selassie in 1974 and the subsequent Ethiopian Civil War. The Qey Shibir was based on the Red Terror of the Russian Civil War, and most visibly took place after Mengistu Haile Mariam became Chairman of the Derg on 3 February 1977. It is estimated that 30,000 to 750,000 people were killed over the course of the Qey Shibir.