On his chicken farm in California, Gordon Northcott kept boys in the chicken coops, sexually abusing them. Northcott was charged with the murder of over 5 boys, and hung on October The 2008 film Changeling is based on these murders.
Auschwitz was not initially built to house/murder Jews and other identified ‘untermenschen’ (sub-humans). It was first built to house Polish political prisoners who were deemed to be a danger to the occupying Nazis in Poland.
The Man in the Iron Mask - the mask was actually black velvet and he was well treated. Given the alias, Eustache Dauger, he was kept in various French prisons from 1669 till his death in 1703. He was referred to as having been a valet and served as such for the Marquis de Lauzun, a fellow inmate. (No one of royal blood would ever be made to perform servant duties, even in prison, so the idea of him being Louis XIV's twin is impossible.)