The linked Daily Mail piece is actually based on this article (which they link to); it has more details: https://www.haaretz.com/world-news/.premium.MAGAZINE-a

The linked Daily Mail piece is actually based on this article (which they link to); it has more details: https://www.haaretz.com/world-news/.premium.MAGAZINE-a-million-people-are-jailed-at-china-s-gulags-i-escaped-here-s-what-goes-on-inside-1.7994216?utm_source=digg https://www.haaretz.com/world-news/.premium.MAGAZINE-a-milli... (Note that even though the link indicates that it's premium content, it is not paywalled).