Click to view a price quote on TSLA. Click to research the Automotive industry. : The United Auto Workers accused the Tesla Inc. (TSLA) Chairman and CEO with "threatening to take away employee stock options in retaliation for Tesla employees engaging in protected union activity" in a post Musk made on Twitter, in a complaint filed with the National Labor Relations Board on Wednesday. Musk is a frequent Twitter Inc. troll, taking shots at short sellers, the media and even Warren Buffett. Some of the messages have irked shareholders as Tesla's June 5 shareholder meeting approaches.