Mont. Code Ann. § 33-7-105

Any incorporated or unincorporated society, order, or supreme lodge, without capital stock, including a society exempted under the provisions of 33-7-126 (1)(b), that is conducted solely for the benefit of its members and their beneficiaries and not for profit, that is operated on a lodge system with ritualistic forms of work, that has a representative form of government, and that provides benefits in accordance with this chapter, is a fraternal benefit society.