San Francisco (AFP) – US labor authorities have filed a complaint accusing e-commerce giant Amazon of using threats and surveillance against its workers trying to organize a union at a New York City warehouse. Amazon allegedly grilled workers about union activities at the Staten Island site, promising to address grievances in exchange for voting against representation, the National Labor Relations Board (NLRB) argued in its complaint filed on Thursday. At stake is whether the workers might be the first to unionize an Amazon warehouse in the United States. NLRB’s complaint alleges the company…