Muslim inmates from internment camps in far western China hunched over sewing machines, in row after row. They were among hundreds of thousands who had been detained and spent month after month renouncing their religious convictions. Now the government was showing them on television as models of repentance, earning good pay — and political salvation — as factory workers. China’s ruling Communist Party has said in a surge of upbeat propaganda that a sprawling network of camps in the Xinjiang region is providing job training and putting detainees on production lines ...