Ask HN: How can you keep a non-evil company on track?

Here's a bit of a "corporate charter hacking" question. If you're founding a company in order to effect social good - some specific purpose that goes beyond shareholder value, that is - is there any way of being reasonably sure it will continue to fulfill its purpose after you've retired?

There are organizations that have stayed true to purpose for long periods of time (the ACLU comes to mind) but if the intent is also to make a profit, I've heard of too many companies that lose track of the purpose of social benefit in pursuit of the profit.

Is this a circle that can't be squared? What mechanisms are already out there? I'm not even sure where to start.