Just want everyone to know that in fact there’s a lot of variety in how unions are run everywhere, including the USA, and an anecdote shouldn’t be universalized.
Big industrial unions seem to be the worst.
I was running a series of interviews with early auto worker union organizers from USA and Canada (they were united at first), and the particular form of corruption that infected the UAW was a kind of takeover by industry management in the late ‘50s, and the old timers I talked to maintained the UAW hadn’t recovered. The CAW, on the other hand, was criticized by members as lacking solidarity with other industries and being too mainstream, though I heard few accusations of corruption.
Divide and conquer has been a long running capitalist strategy.