DIED. Cesar Chavez, 66, famed labor organizer; in San Luis, Arizona. Chavez became a national figure as president of the United Farm Workers in the late 1960s, when he began unionizing poorly paid Mexican migrant workers to raise them out of squalid working and living conditions. His successful boycotts against various grape growers and the producers of iceberg lettuce were widely accepted by Americans during the 1970s. Chavez grew up in a migrant family that lived in shacks, neglected his education and rested its livelihood on fluctuating markets in fruits and vegetables.