A federal board would first have to approve a walkout.
The catering workers, some of whom earn as little as $8.46 an hour, are asking for higher wage and less costly health insurance.
One group who won’t benefit much from Uber’s IPO: its drivers, who numbered 3.9 million at the end of last year. They are likely to see their pay worsen as the company strives to become more profitable while facing public shareholder pressure.
Inside stores, shortages are evident. Meat and produce are rapidly disappearing from shelves, and aren’t being replaced because truck drivers in the Teamsters union are refusing to cross the picket line.
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