U.S. Labor Unions

What do you gentlemen think of labor unions in the U.S.?
What, in your eyes, are the costs and/or benefits of having them?

>>4
Why so somebody could tax me for sleeping too? Because they own my bed?
Seriously State funded Unions take the WHOLE point out of people owning their own firms and make it hard for new firms to begin due to only being able to hire very few workers.
Now if workers want to get together to work something out with the owner then that's fine but to threaten legal force is saying "WE OWN YOUR COMPANY".