Tahir Hamut Izgil watched as parks emptied of people, naan bakeries boarded up their windows and, one after another, his friends were taken away. The Chinese government’s repression of Uyghurs, the predominantly Muslim ethnic minority to which he belonged, had gone on for years in Xinjiang, the group’s ancestral homeland in China’s northwest. But in 2017, it morphed into something more terrifying: a mass internment system into which hundreds of thousands of people were disappearing. Millions lived under intense and growing surveillance. Izgil, a prominent poet and film director, feared…