Ah I knew that would come up. The madrasses-mosques that preach hate , rebellion and jihadism could be closed under the RICO law and could also be closed because they no longer qualify as a purely religious worship center but a political terrorist center. There are nutty religious (really political-terrorist groups)a that are put in jail or raided for criminal activities all the time.
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof"
That's gonna be a tough one to get around without changing the Constitution.