https://www.reuters.com/article/us-usa-amazon-com-nlrb/u-s-labor-board-says-evidence-presented-by-union-in-amazon-vote-could-be-grounds-for-overturning-election-idUSKBN2CF2OZ >WASHINGTON (Reuters) -The National Labor Relations Board on Wednesday said evidence submitted by the Retail Wholesale and Department Store Union (RWDSU) "could be grounds for overturning" Amazon.com Inc's union election in Alabama if introduced at a hearing.