Since the Sept. 11 attacks, the United States has worked aggressively to foil attacks and has imprisoned hundreds of people who joined or helped militant groups. Experts say less attention has been paid to what happens once those prisoners complete their sentences.
Among the incarcerated, according to the Bureau of Prisons, are 380 linked to international terrorism and 83 tied to domestic terrorism. A Congressional Research Service report said 50 "homegrown violent jihadists" were to be released between last January and the end of 2026.
Former FBI Director James Comey, who was fired by President Donald Trump in May, had told Congress that the bureau had more than 900 active investigations related to Islamic State and other extremist activity in all 50 states. Most of those convicted of terrorism-related crimes are held at the high-security U.S. Penitentiary in Florence, Colorado, and federal prisons in Terre Haute, Indiana, and Marion, Illinois. Some are in for life, but the average sentence is 13 years. That means most will walk out of prison with years of freedom ahead.
"There were people I was with in prison who you'd be happy to have as a neighbor because they were normal, reasonable people," said Ismail Royer. He was released last December after serving more than 13 years on firearms charges connected to his work helping others get to a militant training camp in Kashmir.
Royer grew up in a Catholic family in suburban St. Louis. By the time he was 21, he had converted to Islam and was fighting alongside fellow Muslims in Bosnia. At 31, he was serving a 20-year sentence.
Today, he lives in the Washington, D.C., area, works for the Center for Islam and Religious Freedom and wants to help nonextremist Muslim-Americans find their footing in American society.
Behind bars, Royer got to know inmates arrested for only loose ties to terrorism. But he also met Richard Reid, the al-Qaida "shoe bomber," and John Walker Lindh, an American captured in Afghanistan while fighting with the Taliban.
Eric Rosand, who directs a program at the Global Center on Cooperative Security that's aimed at combating violent extremism, said not enough is known about the mindset of the prisoners being released. Experts say there's been no comprehensive research to determine recidivism rates for these individuals.
"We're not talking about 9/11 perpetrators," Greenberg said.
While the State Department has spent more than USD 10 million since 2012 to help other countries deal with an increase in suspected terrorists, Rosand lamented that no similar effort is taking place here.
"People have to go back to some community once they are released," said Rosand, a former senior counterterrorism official at the State Department. "Are we preparing communities for their release? Where are they going to go? Is the community that they came from going to accept them back?" Patrick James, a researcher at National Consortium for the Study of Terrorism and Responses to Terrorism at the University of Maryland said the U.S. Lags behind European and Middle Eastern countries in finding ways to address paths to radicalization or ease the return of released individuals.
Justice Department officials declined comment. But the department's internal watchdog is auditing the Bureau of Prisons' procedures, policies and practices for monitoring inmates with known or suspected terrorist ties, and efforts to prevent further radicalization among inmates.
The issue also is being addressed in pockets of the country.
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