Think Black Muslims and the Nation of Islam. They've been around for a long time in this country.
Malcom X was murdered because he started turning away from the black supremest side. He did a Haj to Mecca and decided that Islam was a wonderful, peaceful religion (boy was he WRONG!!) instead of the hate filled thing he knew in America. He saw that Islam spans all races, not just the radical blacks he knew. He was dangerous to them.