One-fifth of all federal prison inmates are not U.S citizens, many facing illegal immigration charges, according to new data from the Federal Bureau of Prisons.

There are a total of 35,009 “criminal aliens” of 180,344 in prison, and 60% are Mexican, according to an analysis provided to Secrets by David Olen Cross of Salem, Ore., a crime researcher who writes on immigration issues and foreign national crime.

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