If you do a Google search you might be able to find an investigative article on this subject from about ten or so years ago.
I think the article was in a major US newspaper. It mentions the Cape Fox Corporation in Ketchikan and what happened. Sadly, the actual stock holders have little to noinformation on how their business is conducted.  They are told to  hire "educated" people from outside. It's those people and their buddies who get the money not the stock holders.
There was another article about the " Laguna Corporation" which is on the Laguna Indian reservationin New Mexico. Awhile back about 22 people ended up in federal prison for using the tribe's corporate status to steal money from the tribal members. Again, very few of the 22 people were Tribal members.