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In page Custody and repatriation:

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In China there were reported to be some 800 detention camps in 2000 (not including Beijing), and by then several million people had been through them. As well as migrant workers, the Chinese camps usually contained vagrants, beggars, petitioners, and criminals, and the police (Public Security Bureau) earned income by this traffic and sometimes workers' unpaid labor. Often the detentions were unfairly long.[1]