I had a few friends growing up who would just vanish one day, only to find out later they had "gone to Provo". I went to a high school for kids with "disciplinary issues" (massive jerkoff motion) and everyone knew at least one person that had been abducted in the middle of the night to one of these camps. Some people came back more or less okay after several months, some came back fucked up, some did not come back.