For fucks sake. The CATO Institute of liberal leaning fact twisters? How about something from the actual entity that holds these prisoners. https://www.bop.gov/about/statistics/statistics_inmate_citizenship.jsp I've done a bunch of digging in the last 20 minutes across a broad swath of providers trying to discern fact from spin. The general synopsis is that a good chunk of the detained number are incarcerated for immigration violations but almost as many for actual property or violent crimes. Statistically, illegals commit violent crime at a higher rate per capita than others and it is thought that stems from their pool base being more largely slanted to being younger males, a known higher crime group. Bottom line is every source checked confirms a number in the 5-6% range of the total incarcerated being illegals incarcerated for some type of crime. It is estimated that the total illegal population is about 3% of our nations total population (12 mil).