A San Francisco federal court decided Monday that Tesla must pay a former worker, Owen Diaz, about $137 million after he endured a hostile work environment and racist abuse working there as an elevator operator.According to his attorneys, the case was only able to move forward because Diaz had not signed one of Tesla’s mandatory arbitration agreements which the company uses to force employees to resolve disputes without a public trial.A shareholder activist, Nia Impact Capital, has asked Tesla’s board to study the effects of mandatory arbitration agreements on the company, voicing concern that they enable harassment and other problems.