Nov 1 (Reuters) - The U.S. National Labor Relations Board will convene a hearing on Amazon.com Inc (AMZN.O) workers" petition to unionize their Staten Island, New York, warehouse on Nov. 15, labor organizer Chris Smalls said in a tweet on Monday and confirmed to Reuters. The hearing plans follow workers" request last week for a union election. Amazon has long resisted unions in the United States, with its workers in Alabama recently voting against forming a union by a more than 2-to-1 margin, but it is facing growing labor pressure. Spokespeople for the NLRB and Amazon did not immediately return requests for comment.