U.S unions, rock!!
All unions are different and even more different depending on the respective country, since labor laws differ in each country. American unions have historically been at the forefront of change to not only raise the standard of living and improve working conditions for union labor, but labor as a whole, that is simply the truth. Also it simply depends on your labor skills, in short, the more highly skilled your group is, the more power you have to collectively bargain.