Hands of a grower and a farm worker clasp in the background, as César Chávez (l) of the United Farm Workers (UFW) union and John Giumarra Sr., representing 26 of California's largest table grape growers, exchange pens to sign a contract with the UFW on July 29, 1970, in Delano, California. Chávez's UFW has pushed a boycott on table grapes for the past five years. With this signing, the UFW now has contracts with 85 percent of the table grape growers.
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