Gee, thats a tough one. I study karate and I don't relish training alongside lebanese muslims, who are the exact type of people who abuse the power that martial arts gives you, by bashing and raping people. (I live in muslim infested eastern australia btw.) I guess you could try:    Telling any black prospective member that Im sorry, but that class/group is full, you should try (insert another institution here). tell them that you'll put them on a waiting list, and send them on their way.    Marcus