A group called “Blackfoot Soldiers” led by someone called Issaquah is Muslim? I think someone got bad information.
This is a real organization, and a national one at that. It appears that "prison Islam" is heavily involved, though probably not mandatory for membership (I'm sure they'd happily accept the Jeremiah Wright "Christian" crowd, too).
I won't post an active link to their site here, so paste the following URL into your browser and see for yourself:
http://nationalblackfootsoldiernetwork.wordpress.com/