A former member of Cambodia’s genocidal Khmer Rouge regime became the first from the ultra-Maoist movement to stand trial before a U.N.-backed tribunal Tuesday. Kaing Guek Eav, known as Duch, faces charges that include crimes against humanity and grave breaches of the 1949 Geneva Convention during the regime’s 1975-79 rule. He is standing trial just outside the Cambodian capital, Phnom Penh, before the Extraordinary Chambers in the Courts of Cambodia, which is made up of Cambodian and international judges.