I'm not against it. I just don't see them working, especially for low skills jobs where the biggest competition is the many who are willing to replace them at any time, possibly for less.

If companies need good workers, then there is a market for them making the union pointless. For example, in my skilled trade, I have no issues getting top compensation without union representation. The scarcity of me and those with similar skills encourages good incentives for good workers.

On the other hand, if there is no scarcity, then bargaining becomes very difficult. There may be some middle ground where a union can work, but I don't see it. The last time I was in a union, the animosity between employee and company made for a stressful employment.