Tesla also introduced rules requiring permission for the distribution of union pamphlets and other materials in addition to threatening the loss of stock options if unionization occurred. The company also told employees that it would be “futile” to unionize because they would lack a voice, according to the ruling.

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Those constituted “unfair labor practices” under the National Labor Relations Act, ruled Administrative Law Judge Amita Baman Tracy.

It’s not the first time Musk has gotten in trouble for his tweets. Last year he ended up in a dispute with the Securities and Exchange Commission over his tweet saying he had “Funding secured” to take the company private. Musk was removed as chairman of the company’s board, and he and the company were each fined $20 million in a settlement of the charges. He is also now limited in what he’s allowed to post on social media.

Federal safety regulators also accused Musk of issuing “misleading statements” on his company’s Tesla Model 3 last year, sending a cease-and-desist letter after the chief executive claimed it was safer than other vehicles.

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Tesla did not immediately respond to a request for comment on the Friday ruling.

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Tesla also unfairly disciplined employees who were seen as engaging in activity to advance a union, according to the ruling. Tesla must offer a fired employee his job back and remove disciplinary records for him and another worker who was warned in connection with his union activity, according to the ruling, which was first reported by Bloomberg News.

Tracy cited more than 10 actions committed by Tesla and Musk that violated provisions of the Labor Relations Act and ordered remedies including back pay and re-employment for the fired worker, the rescinding of rules that targeted union activity and a meeting at Tesla’s plant in Fremont, Calif., where the company must give workers detailed notice of the labor violations.

Musk must be present for any such meeting, the judge ruled.