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.
"If the American labor movement thinks that we can just go out there and start and control the organizing that takes place, we’re not going to be successful," says Stuart Appelbaum, president of the Retail, Wholesale and Department Store Union. "I think what we can do is create an environment in which organizing takes place... We have to think of ourselves less as an institution, and more as a movement."
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