I'm surprised FDR didn't allow Nazis to immigrate to the U.S. during WWII to show that he was not prejudiced against Germans.
As the United States carries out yet another bombing campaign across two Islamic countries, the Obama administration is redoubling its efforts to stanch the flow of radicalized young Muslim Americans traveling to Syria to join the fight and potentially returning as well-trained militants to carry out attacks here.
American law enforcement and intelligence officials say more than 100 Americans have gone to Syria, or tried to so far. That number of Americans seeking to join militants, while still small, was never seen during the two major wars fought in Afghanistan and Iraq after the terror attacks of Sept. 11, 2001.
http://www.nytimes.com/2014/10/05/us/us-is-trying-to-counter-isiss-efforts-to-lure-alienated-young-muslims.html