Amazon workers in New York on Friday voted to launch the first US union at the e-commerce giant, an underdog upset for a company that has steadfastly opposed organized labor in its massive workforce. Dozens of supporters greeted the result with cheers and applause, while union organizer Christian Smalls popped a champagne cork in front of a bank of TV cameras and photographers. “We want to thank [Amazon founder] Jeff Bezos for going to space, because while he was up there we were signing people up,” Smalls said after workers at the Staten Island JFK8 warehouse backed the union by 2,654