I was black-balled by the IBM in the late 60s because I attended my initial meeting (as a guest)with three friends. One was an excellent African-American magician. Another was a woman, who knew some magic and was a body-builder. (Card-carrying members thought she was a lesbian.) The third person was a jazz musician, whose hair was longer than mine at the time. His last name sounded suspiciously Jewish.
Of course, I was attempting to join the IBM in the deep south, a place that was at the time recently integrated and where IBM members shunned SAM members.
A number of years passed before the local clubs let me join their ranks...and even then (perhaps justifiably so)members were somewhat standoffish and dubious about my pedigree. At least I didn't feel like a leper with a bell around my neck. At the time I consoled myself that David DEvant was kicked out of the Magic Circle (although it had nothing to do with his flawless, English pedigree).
I'm happy to say that the local IBM and SAM clubs NOW have members who are female, Jewish, Black, and gay. There were, however, a few members who resigned after such people joined.
Sad but true...