Mr. Monk's Other Brother - S7-E10
Continuity mistake: When Adrian is talking to Dr. Bell, after he says, "And they needed help," you can see that Dr. Bell's glasses are in his left hand. In the next shot, you can see that they are on his face and his hand is empty. (00:29:15)
Answer: The two men are trying to work out a secret deal between them without involving the union, which means the workers' interests aren't being represented and defeats the whole purpose of a union. The mayor would lose labor's support and Cusack's union troubles would just be starting.
Captain Defenestrator