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In page Masanjia re-education through labor camp:

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It was first established in 1956 under China's re-education through labor, or laojiao policy, and was expanded in 1999 in order to detain and "re-educate" followers of the Falun Gong spiritual practice. According to former detainees, Falun Gong practitioners represent 50–80% of inmates in the camp.[citation needed] Other prisoners include petty criminals, prostitutes, drug addicts, petitioners, and members of other unapproved religious minorities, such as underground Christians.