I don't have much to say about union history, but this thread deserves more than the shitpost that is
>>21209 so have a recent anecdotal account.
Two (potentially three) of my country's education/teachers' unions have just outed pro-Zionist leadership this month, socialists and pro-Palestine voters constitutionally forced a vote for a statement of solidarity with Palestine, had a democratic supermajority and the leaders resigned in protest. Apparently one was a radfem too.