I've never heard of your organization, but I'm happy to hear about anyone who is interested in the subject of black people working professionally in magic.
Just a short list of people I know of or have met:
Bill Gross -- close-up worker from Baltimore
Puck -- bird worker predominantly, but also all around magician, assists Denny Haney of Denny & Lee. Baltimore.
Kenrick "Ice" McDonald -- bird worker from L.A.
Charles Greene III (you know already) - corporate trade show magician, D.C.
Frank Brent (you know already) -- all-around performer, Monday Night Magic, NYC
Eric Anderson -- close-up, street performer, Atlanta
Randy Shine -- close-up, stage performer, Philadelphia
Goldfinger & Dove (Jack Goldfinger, & his Asian wife, Dove) -- stage act, L.A.
Phelston Jones -- stage act (did a fire act in "World's Greatest Magic" -- Vegas (I think...)
Earl "Presto" Johnson -- NYC legend
For some reason (most likely the fact that I'm actually having to _think_ about this), I can't think of any more, although I'm sure I recall haveing come up with about 30 names at one point offhand.
I hope that gets you started.
(and someone who's actually a black person himself, which really surprised his mom at the time...)