The administrators ARE IN the union, and probably are the administrators of the union.
I've always thought that was a conflict, that administrators should have their own union and that teachers would fare better as adversaries.
The union here is worthless. By the time a legal situation gets bad enough for it to be addressed, it can take years out of a person's life (it happened to a friend of mine, with a bogus charge).
I'm a retiree, and pay retired dues, granted, not a lot, but still I'm a member, right? Well, we don't have union legal protection in the classroom, and the union doesn't back us for things like prep period coverage.
Why do I do it? The local school recently got a decent administration that understands that if they treat substitutes like pool slime, they won't have any.