81.3—Group eligibility.
(a)
No tribe which has voted to exclude itself from the provisions of the Indian Reorganization Act, or is otherwise precluded by law, may be reorganized under a Federal Statute. Tribes wishing to reorganize or a reorganized tribe seeking to amend its constitution and bylaws or wishing to vote to revoke such document shall do so under the regulations in this part.
(b)
Charters issued to reorganized tribes shall be ratified or amended under the regulations in this part.