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Of all the tactics brought to bear upon the growers in the sixties, the most important was the United Farm Workers’ (UFW’s) ever-resourceful grape boycott. Here, ironically, the weakness of the 1935 National Labor Relations Act (NLR A), which had left agricultural workers out of its purview as a sop to southern political interests, proved beneficial. The Taft-Hartley amendments had eliminated the secondary boycott, which otherwise would have allowed unions to boycott firms who did business with an employer that was being struck—that is, boycott the secondary handler of a good. For the farmworkers, not being covered by the act meant that they could take their struggle from the fields to the secondary sight of the supermarkets that sold grapes. Working outside of the New Deal order, in essence, proved to be the workers’ best hope and most successful strategy.
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Jefferson R. Cowie (Stayin’ Alive: The 1970s and the Last Days of the Working Class)