While the United States battled the Communists of North Vietnam in the 1960s and '70s, the neighbouring country of Cambodia was attacked from within by dictator Pol Pot and the Khmer Rouge. The Khmer Rouge imprisoned, enslaved, and murdered the educated and intellectual members of the population, resulting in the harrowing "killing fields"-rice paddies where the harvest yielded nothing but millions of skulls. Young Sichan Siv-a target since he was...