As he began speaking, Majok lowered his small coca-colored eyes and stared intensely at the ground. It was the summer of 2002, and I had just flown thousands of miles deep into the war zone of Sudan, the largest country in Africa, to interview former slaves. Majok, then 12, tightly hugged his long, bony legs, as we sat on the parched termite-infested ground. His ragged black shorts and ripped oversized tee-shirt hung loosely on his spindly, dust covered body. He spoke of the way he was repeatedly raped and sodomized by gangs of government soldiers, as I watched a continuous...