region, building camp that's locked up more than 1 million people and ripped loves onces away from their families. former camp prisoners say uighurs have been tortured, forced into having abortions and even sterilized. detainees are brainwashed with communist party ideology. they're forced to speak mandarin rather than their own native language and they're forbidden from practicing the religion they followed their entire lives. >> there is a kind of cultural genocide going on here. >> why is xi doing this? because he sees uighurs as a threat to china's very survival. he's afraid they will split from the country and form a whole new nation. separatism is one of xi jinping's greatest fears,