Kang Kek Iew
Kang Kek Iew, or "Comrade Duch", was one of the leaders of the Khmer Rouge. He headed the Santebal—a special branch of the Khmer Rouge in charge of internal security and running prison camps. In addition, Kang Kek Iew ran the notorious Tuol Sleng (S-21) prison in Phnom Penh.