21%
'Administration officials have noted that roughly one in five inmates in federal prison are foreign-born, and that the vast majority of those people are in the United States illegally. They argue such statistics show the dangers illegal immigration poses to society. "The illegal immigrant crime rate in this country should be zero," US Attorney General Jeff Sessions said in a statement earlier this year. "Every crime committed by an illegal alien is, by definition, a crime that should have been prevented."
Advocates have slammed statistics released by the administration. "The vast majority of immigrants in federal prison are there for crimes that only immigrants can be charged with -- illegal entry and illegal entry after removal," Tom Jawetz, the vice president for immigration policy at the Center for American Progress, told The New York Times in 2017. "When you cook the books you shouldn't pretend to be surprised by the results." '

So some large percentage of the 21% are in turn illegals...most of them in prison for (wait for it)...being here illegally or illegally re-entering.

Your fearmongering remains Hitlerian...