Dolores Huerta

Dolores Huerta co-founded the United Farm-workers of America. Although she got a teaching degree in college, she moved on to organizing, where she knew she could make a bigger difference. One of her ideas was to spearhead the grape boycott ("no grapes!") in the 70s. More information on her can be found here.

When I googled her, I found this:
Dolores Huerta and Richard Chavez Endorse Dean for President