For $44 Billion, Musk Got Twitter—and a Host of Legal Problems

Federal regulator probes over alleged securities violations and data lapses and a law firm billing dispute are among the legal headaches dogging Elon Musk ever since he bought Twitter Inc.

Bloomberg News reported Friday that the National Labor Relations Board filed a formal complaint accusing X, formerly known as Twitter, of violating federal labor law by firing an employee in retaliation for her internet posts challenging the company’s return-to-office policy.

After Musk ordered workers back to the office last November, the employee told other workers in a tweet, “Don’t resign, let him fire you,” and sent a similar message on ...