Cesar Chavez campaigned for the rights of farm laborers in the United States, co-founding the United Farm Workers (UFW) union. His activism focused on improving working conditions, fair wages, and better treatment for agricultural workers. Chavez organized strikes, boycotts, and marches to raise awareness of labor injustices within the farming industry. His work has had a lasting impact on labor rights and immigrant advocacy, highlighting the importance of collective action and social justice in pursuit of equality for farm workers.