In the opening scenes of Shuibo Wang’s 2005 documentary, “They Chose China,” American soldiers dressed in the long, padded winter coats of the Chinese military cluster around a microphone to explain the international threat posed by McCarthy’s witch hunts and U.S. intolerance for freedom and democracy. The documentary tells the story of these twenty-one American soldiers, held as POWs by the Chinese during the Korean War, who refused repatriation after the 1953 armistice. Through a mix of archival footage, Chinese and American TV clips, and contemporary interviews with one of the few surviving defectors, Wang tries to unearth why the young men chose to stay in China, attend university, and work as factory workers, farmers, truck drivers, an...