^ that has happened to me. Along with a million other slights: health care reduced, vacation time reduced, etc. etc. A hypothetical union boss running off with dues never has.
Think very carefully about where this abstract fear of "bad union bosses" comes from.
It’s what you do when anyone is in breach of contract or some other civil matter. You just sue them.
If it’s a criminal fraud, there’s other people who will help, we call those the authorities.
If it's just a hypothetical, consider this:
The money doubles and everyone laughs about it in the end.
Years of crime and corruption caused long perception and union density declines from the 50s to the late 80s, when hundreds of officials finally got RICO’d, some unions fell under government supervision, etc.
They still didn’t really give up on crime and corruption, but they never really recovered in the US.
Or are you just fear mongering about unions?