http://www.city-journal.org/html/16_2_sndgs04.html
Paul Howard
"U.S. counterterrorism officials have known for several years that al-Qaida views the U.S. prison population as a fertile source for recruiting homegrown terrorists - the kind that slip through security measures designed to catch foreign jihadi. Would-be 'dirty bomber' Jose Padilla, for instance, was a former Chicago gangbanger who converted to radical Islam in prison and traveled to Afghanistan for jihad training. Many observers believe Islam to be the fastest-growing religion behind bars, particularly among black convicts; Muslim prison gangs are proliferating. On some estimates, as much as 20 percent of the New York state prison population may be Muslim."
