[asark]

Some bad companies: no big deal, no one's making you stay, leave if you don't like it.

Some bad unions: all unions are awful and the solution is to not have unions.

[username90]

If a company is bad you can just switch to another company, if a powerful union is bad you'd have to switch to another industry.

[dragonwriter]

Or convince other employees in your workplace that that union is bad and decertify them (perhaps replacing them with a new union that you and your coworkers form, either independently or affiliated with a better parent union.)

[Yoric]

I imagine that this may be true, but only if there's a single union in the industry. Why on Earth would that be the case?