A California judge, Judge Tracy, has ruled that Tesla, an automotive and energy company, has violated US Labor Laws. In April of 2017 the International United Automobile Workers Union (UAW) filed a case against Tesla. The UAW cited issues of safety, extended working hours, and threatening attitudes toward unionizing employees at Tesla facilities. The company’s founder, Elon Musk, even posted a controversial tweet that insinuated that if employees unionized they would subsequently lost their stock options at Tesla. Judge Tracy has ordered Tesla to stop any action that interferes with an employee’s right to unionize, and has ordered Tesla to reinstate and properly compensate any union employee that had been fired as a result of the unionizing effort.
See "Tesla and Elon Musk's Tweet Violated Labor Laws Protecting Unions, Judge Rules", Tara Law, September 30, 2019