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Article:
https://www-m.cnn.com/2019/09/12/middleeast/syria-al-hol-camp-isis-intl/index.html
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Tag them electronically. They're felons; give them identifiers that you can track. My concern is that some of them are stupid enough to cut off limbs, so I would try to think of a way around that.
I suppose you could also give them the option of uncovering their faces; that or tagging. Tagging is probably going to be more helpful in preventing crime.
Also make sure that everyone has enough to eat, enough sleep, medical care and something interesting to do. Nobody likes to be cooped up, hot and bored.