In 1887 the United States granted to a group of Aborignal  or First Nations people from British Columbia the right to choose land in Alaska to relocate to. They traveled by canoe from Canada to an island that was later (1891)  "given" to them as a "recognized" Federal Indian Reserve or reservation. As far as I know it is the only federally recognized Indian reserve in all of Alaska today. It is known as the Metlakatla Indian Community, a federally recognized tribe located on Annette Island which is the federally recognized reserve or reservation in Alaska. The community is governed by a elected Tribal Council.  They do have a small gambling parlor with slot machines and "large"stake BINGO games but so far no mafia has appeared yet. Most areas of "Indian Country" are very isolated and off the beaten path of easy access. In a number of states where Indian casinos already operate they have agreements with the state government gaming commissions. 
https://www.metlakatla.com/community.php