The ANSCA corporations were set up to conform to, and work within existing laws, as they had to be able to interact with all the other corporations in the world.  And that is where it ends ... we are family, and our corporations are, in practice, family businesses.  The Board of Directors certainly make decisions and do business, like any regular corporation, on the surface ... but the real power is still held by traditional clans, each to their own long established interests.  "Auntie Em" still has more real say in what the corporations do, than the directors.  Whale boat captains, hunting leaders, traditional dancers and carvers, elders, all have much influence.  The boards not only listen to them, but the boards do as they are told.  And it isn't a "do this or that" kind of being told ... it's more like "You want us to honor you at your funeral, and continue to support your clan?"  "Let all of your family keep their high life-style, their High-Cast?"  "Then honor traditional power!"