What you say about unions having fewer constraints is interesting. I think it's important that both sides be made to play fair in such things, and the laws could use a review. I just think in principle unions are important in certain industries due to the structure of the industries themselves. Especially ones with a centralized nature, such as trains, electricity, cable TV, and fossil fuels. That unions are important in these areas is shown by them having a longer, stronger history of such.