It'd be interesting to see when they actually arrived. Many have been radicalized here in the states cause many of them were born here.
During the Cold War, we were sensible enough to exclude Communists. We had the Attorney General's List of subversive organizations. We even required Loyalty Oaths and disclaimers of belonging to any of these subversive organizations.
But, now, since we are now Politically Correct, anybody who wants to come to America for any reason is obviously welcome, if not encouraged,... unless they are Christians fleeing from the Muslim murder squads, of course.