prisons felons

Dangerous prisoners

answer: 

These Quick Facts from the Bureau of Prisons might give you a starting place for looking at data about federal prisoners. As you can see, a majority of the offenses are related to drugs, weapons, or immigration. I am not sure how exactly you would go about extrapolating from these numbers exactly who the most seriously violent criminals are, but it will at least give you a starting point, and other Radical Reference volunteers may suggest additional resources.

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