The United Steelworkers Union has accused Tesla of firing pro-union workers at its plant in Buffalo, New York. Allegations made against the firm, insist that employees were fired due to their union affinity; and in one case the union claims that Tesla attempted to interfere with an employee’s ability to find a new job. The NLRB is currently investigating these allegations, made by only one of two unions striving to organize the Buffalo plant employees. Tesla has claimed that these allegations are “without merit” and that the firm intends to follow the NLRB’s process.
See "Tesla accused of firing pro-union workers at Buffalo solar plant", Matt Glynn, The Buffalo News, June 24, 2019