ソン・セン
Son Sen ( ; 12 June 1930 – 15 June 1997), alias Comrade Khieu (), was a Cambodian Communist politician and soldier. A member of the Central Committee of the Communist Party of Kampuchea/Party of Democratic Kampuchea, the "Khmer Rouge", from 1974 to 1992, Sen oversaw the Party's security apparatus, including the "Santebal" secret police and the notorious security prison S-21 at Tuol Sleng.