Enemies of the People (2009)

A Cambodian whose family was among the 2 million victims slain by the Khmer Rouge, Thet Sambath patiently spends his time, energy and money gaining the trust of the regime's cold-blooded murderers in hopes of capturing their confessions on tape. Several years in the making, this powerful documentary showcases horrific stories told by the culprits themselves, including the notorious Nuon Chea, Pol Pot's second-in-command dubbed "Brother Number 2."