For years, Walmart has fended off repeated efforts by unions and their supporters to organize its workers. Now, that battle is again escalating. In a rare move, Walmart is trying to stop a union-backed group from staging a series of demonstrations against the company on Black Friday, the busiest shopping day of the year. The nation’s largest employer and retailer has filed a complaint with the National Labor Relations Board — its first in a decade — seeking to prevent a group known as OUR Walmart and supported by the union from holding at hundreds of stores what the group says will be the biggest protests of this kind against the company.
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