http://www.guardian.co.uk/world/2011/ma ... aming-scamAs a prisoner at the Jixi labour camp, Liu Dali would slog through tough days breaking rocks and digging trenches in the open cast coalmines of north-east China. By night, he would slay demons, battle goblins and cast spells.
Similar practices are supposedly very widespread in China and have been forever basically. People being people it's what you (eventually) end up with when you have a society with intense government secrecy.
US jails\prisons have been busted doing similar things, nowhere near the same scale or duration though.