I’m not sure the legal basis for these statements. But even setting that aside, it’s not “black balling.” USEF is a private membership group. If they want to exclude members who eat oatmeal for breakfast or can’t carry a tune or associate with Keanu Reeves-- they can. No one is being “black balled.” He has been excluded for failure to abide by the organization’s rules. Assuming they interpret “aiding and abetting” as clinicing with GM (I have not seen a statement from USEF/SS that they do interpret the clause that way, but it’s not an unreasonable read of the language) then the clinic participants would also be excluded from failing to follow the organization’s rule.
USEF could pass a rule saying no one who is a USEF member can wear green on Monday. If you get caught wearing green, they can revoke your membership. If they pass a rule saying anyone who eats lunch with non-member violates the rules, and you’re caught eating lunch with a non-member, USEF can exclude you too.
It’s not that complicated.
That being said, it is not 100% clear to me how expansively USEF/SS will interpret the “aiding and abetting” language. Now I think we’re finally in a situation where they might have to start applying the language. A fish sufficiently big got himself banned… finally a fish so big that people are going to continue to publicly associate with him.