The Phoenix Program (Phung Hoang) was a joint CIA-South Vietnamese intelligence operation running from roughly 1965 to 1972, targeting the Viet Cong Infrastructure (VCI) through capture, interrogation, defection, and killing. CIA Director William Colby testified before Congress in 1971, confirming approximately 20,587 VCI kills through July 1971; South Vietnamese figures put the overall total at 40,994 by the programme's end. Declassified records confirm systematic extrajudicial killing and torture. The programme is a confirmed historical operation, not a conspiracy theory — its scale and methods were obscured from the public during the war, fitting the definition of a concealed government operation.