[jnbiche]

> I don't quite understand the power imbalance here

There's only a power imbalance if workers are prevented from organizing, or if they (for whatever reason) refuse to organize. Or if they workers are very easily replaceable.

Obviously, if you're one of 200 workers, you can't negotiate evenly with the ownership as 1/200th of the company's workforce. Same goes if you're an unskilled worker who is easy to replace. However, even then, if you organize with all 200 of your co-workers, you are closer to a balance in negotiating power since it would be hard for said company to replace all 200 workers at once.