They also used a system of parole in which freed prisoners had to report twice a month to local officials to have their behavior reviewed. In keeping with the Mongol principle of group culpability and responsibility, the freedom of a prisoner depended, in part, on his willingness to join an auxiliary law enforcement agency in order to apply his knowledge or crime to the apprehension of other prisoners. Criminals, and often their entire families, had to sign documents acknowledging receipt of their sentence and to register their disagreement or complaint with the process. To preserve the record
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