Now Tesla has another battle on its hands, this time with unhappy shareholders. : They argue that Tesla's board has failed to hold its charismatic but controversial CEO Elon Musk to account about the company's finances and performance, rubber stamping Musk's decisions instead. Three Tesla directors are up for a vote at next week's annual meeting, and one activist shareholder firm wants to dump all of them. Among them are Kimbal Musk, brother of CEO Elon Musk. That effort is being led by CtW Investment Group, which works with union-sponsored pension funds.