La Causa: UFW Flag
Annotation
Under the leadership of Cesar E. Chavez, Dolores Huerta and others, the United Farm Workers (UFW) struggled to improve the deplorable conditions of farm workers. The UFW used community organizing, marches, non-violent resistance and consumer boycotts to rally national support for their cause. Cesar Chavez's brother Richard Chavez designed the Aztec eagle as the UFW logo, squaring off the edges so that it would be easy for workers to reproduce on flags and posters.
Source
Division of Politics and Reform, National Museum of American History.