I for one did not know that there are regulations to the act of blacklisting an equity member.
8. BLACKLISTING.
The Producer and Equity pledge themselves to prevent blacklisting in the theatre. Opposition to blacklisting is not a controversial issue between the Producer and Equity.
(A)Blacklisting for the purposes of this Rule shall mean the submission by the Producer, directly or indirectly, to individual or group pressure, and/or the use of private lists,
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published or unpublished, of persons not to be employed in theatrical productions for reasons having no direct relation to their theatrical ability.
(B)To that end, Equity and the Producer shall jointly investigate and deal with all complaints of blacklisting in the theatre, and take any and all lawful means to correct, remedy, and actively resist each and every instance of blacklisting, as and when it arises.
Found in section 8 of the ANTC Agreement (Association of Non-Profit Theatre Companies).
I found this interesting primarily because of the history of blacklisting in theatre and the entertainment industry during the Red Scare and also due to how many times in academic theatre students are warned that you could get yourself blacklisted if you behave unprofessionally. Granted, they most likely don't mean "blacklisted" in the technical meaning of the term, but I would bet many newer equity members don't realize there is a protection against the practice.
When I was involved in unpaid community theatre a situation occurred where a performer was blacklisted and not informed. It was a misunderstanding that took almost two years to correct because at first no director/board member told them about the ban on casting them. I find this equity clause to be a great protection against situations like this (although it would be harder to identify blacklisting in the large equity market, I would imagine).