Answer:
Cesar Chavez.
Step-by-step explanation:
Cesar Chavez grew in a family of migrant workers who provided labor in the fields.
As a result, he got to understand the hardships that the workers face. He thereafter devoted his time and resources to diplomatically fight for the rights of workers.
He formed the national farm workers association, through which he would actualize his agenda. He joined hands with the agricultural workers organizing committee to form the United Farm Workers, after a joint strike against the grape growers.
Years of struggle for change in condition and treatment of the grape growers gave the fruits of farmers agreeing to sign contracts with the workers.