Well generally with more or less standard docs in place, the board can vote to remove the offending person from the company. And then it's just a matter of the

Well generally with more or less standard docs in place, the board can vote to remove the offending person from the company. And then it's just a matter of the vesting schedule as to the leaving person's remaining stake (this is why founders should have vesting). Not saying there won't be something of a legal battle, but certainly there's no special provisions necessary which you wouldn't expect in standard startup articles of incorporation.