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Forty years after Harvest of Shame, Edward R. Murrrow’s great documentary on the exploitation of migrant workers, the shame endures. Now overwhelmingly Spanish-speaking, the nation’s estimated 1.5 million farmworkers, are the most vulnerable laborers in the U.S. federal legislation excludes them from many rights most other workers have, such as a minimum wage, overtime pay and the ability to engage in collective bargaining.