Earlier quoted context omitted.
The power of labor unions for low-paid workers is not as strong as you think. Where I went to school (U Chicago), there was a very active mostly student-organized university workers' labor union, but workplace violations were still routine. The power to strike is no help when you depend on your paycheck to survive, and the union's legal clout was no help when the laws were hard to enforce and deep-pocketed employers…
The power to strike is no help when you depend on your paycheck to survive Well managed unions maintain a strike fund so that their members can survive the economic hardship of a strike. After googling a little I think you are talking about Graduate Students United - their dues are only $5/year, which means they aren't even in the same league as the serious blue collar labor unions. http://uchicagogsu.org/faq/
Recent grocery store workers voted to strike and the pay was going to be $100/week for picketing 15-20 hours a week. Great.