Cesar Chavez (1927-1993) was a Mexican American farm worker who became a labor leader and widely admired civil rights activist. He co-founded the National Farm Workers Association, which later became the United Farm Workers (UFW). The UFW website offers a complete biography of Chavez.
La Raza Unida was a political party formed in Texas in 1970, which rapidly spread to other states. Its first national convention was held in El Paso, Texas, in 1972; about half of its 1500 participants were women. Although the formal party organization did not last long, the movement was very influential. Read the whole story in the Handbook of Texas Online.