Look for the Union Label
Unfair competition from low-wage imports has been a problem for decades: check this classic TV commercial from 1981 featuring members of the International Ladies Garment Workers Union, now part of the UNITE HERE union.
A Difficult Balancing Act
You, as an individual, gain strength by uniting through the union with others in your workplace. Using your collective power you have greater strength to defend and promote your interests, like higher pay and better benefits. For the good of the group, each individual gives up a bit of the ability to do whatever he or she pleases. Being a member of a union gets you the good things that come from being part of a group, but you have to give up a certain amount of individual control. (As you think about that, don't forget this: in a non-union workplace the employer makes all the rules.)
—Adapted from The Union Member's Complete Guide, by Michael Mauer