If you confine your definition to only unions, your definition of corrupt will fall short. I think corrupt is more accurate, but let me add another line.
Unions..... What...... Corrupt.
political correctness is union
Ill add a few others for good measure.
GOPe.....
Education system.....
Media......
Big business...... (Most of em)
Chamber of commerce......
All governance from homeowners assoc on up to the Feds.......
It’s a start of a list, but it is accurate.