A recent tweet sent by Elon Musk could put Tesla in trouble with federal labor regulators. Musk wrote on Tuesday that unions caused the bankruptcies of General Motors and Chrysler in 2009, compromising over 200,000 workers. Specifically, the CEO blamed the United Auto Workers for “destroying a once great US auto industry”. The UAW responded with tweets of their own, but the bigger concern for Musk is that the union may file unfair labor practice complaints with the NLRB, according to the agency’s former Chair Wilma Liebman who led the NLRB during the Obama Administration. The UAW has been actively trying to organize workers at the Tesla plant for more than a year.
See "Musk’s Stock-Option Tweet May Invite U.S. Labor Board Complaint", Josh Eidelson and Dana Hull, Bloomberg, May 23, 2018