I wonder how many more are out there???
Well, I could tell you the story about a friend of mine who works for an aviation and satellite software engineering company. The engineering director and a huge chunk of the engineers are from Iran. Yep, Iran and most of them are related. Cousins, uncles, brothers, neices...And they are working on software for our satellites and planes.
If that doesn't make you feel warm and fuzzy. I can tell you about the guy they recently fired and when they confiscated his laptop, he has numerous Islamic webpages bookmarked. All kinds of whacked out stuff, though nothing that appeared to be overtly terrorist related or anti-American.