Answer: Several examples of people and organizations fighting for Civil rights.
Explanation:
The author is drawing attention to the fact that people of Latino descent have been some of the major driving forces behind civil rights movements in the United States by giving actual evidence of people who did so.
The author includes the artist Diego Rivera and how his art depicted factory work. The author then included the actions of Dolores Huerta and Cesar Chavez in founding the UFW and how through it they fought for civil rights.
These examples give credence to the author's claims that Latino Americans have been at the forefront for the civil rights movement.