In the most recent development since Tesla workers announced a union campaign at a factory location in Buffalo, New York, a new charge has been filed with the NLRB claiming that the Tesla Workers United Twitter account has been shadowbanned. As Elon Musk is the CEO of both Tesla and Twitter, he is named directly in the complaint. Workers claim that their union's Twitter account does not appear when it is inputted into the search function of the app and that this has made their platform less accessible, which has impeded their right to protected concerted activity.
See "Tesla workers file new charge with NLRB, claiming their union Twitter account has been shadowbanned", Paul Blest, VICE, February 17, 2023