In 1975, after five years of devastation and upheaval caused by civil war, the Cambodian people welcomed the victorious communist Khmer Rouge led by Pol Pot. Once in power, the new regime tightly closed Cambodia to the outside world. Four years later, when the Vietnamese communists invaded Cambodia and defeated the Khmer Rouge, the world learned that during their control the Khmer Rouge had turned the country into "killing fields," in one of the...