I’m not anti-union but I am warily of unions getting too powerful.

You cannot assume that unions will always do the “right thing”.

A lot of unions encompass the entire labor force of a sector effectively becoming monopolies on labor. Those aren’t healthy for the economy as there is nothing stopping them from abusing their monopoly position.

Frankly, corporations at least have antitrust laws to check them. Are there laws checking the power and abuse of power of unions?