Zhang Haitao was a rare voice in China, a member of the ethnic Han majority who for years had criticized the government on social media for its treatment of the minority Muslim Uighurs. Zhang’s wife had long feared some sort of backlash despite her husband’s relative obscurity. He was a working-class electronics salesman, unknown even to most Uighur activists. So she worried that authorities might block his social media accounts, or maybe detain him. Instead he was arrested and prosecuted for subversion and espionage. His punishment: 19 years in prison.