> If you work in a unionized workplace and have complaints about a coworkers capability, your complaints should first be heard by your union because your union is the arbiter of your labor force, as per the contract you sign with said union.

The question obviously being, what are you supposed to do if they fail to address it?

Suppose the union leadership brought in a bunch of their own incompetent cronies and is now making a hash of things, but you can't vote them out because those same cronies keep voting them in.