The WaPo article on yesterday's raid at an Islamic institute puts things in a rather odd way:

Federal agents yesterday swarmed into an Islamic institute in Northern Virginia that has been the target of a joint U.S.-Saudi crackdown over allegations that it promoted an intolerant brand of Islam...

Last I looked, promoting intolerance per se is not a crime. I certainly hope the WaPo just got that wrong.

While arresting and deporting people based on visa violations may or may not be a pretext, one hopes that the Feds have evidence of a tangible connection between those at the Institute and terrorists or planned terrorist activities.

Based on past reports, there might just be. However, just being intolerant is not yet a crime.