2026 Membership Book FINAL

Case 1:25-cv-12578-RGS Document 41 Filed 10/16/25 Page 4 of 7

disseminate information to the Indian gaming community, federal and state governments, and the general public concerning issues related to gaming in Indian Country. WIGA advocates on behalf of Washington’s Indian gaming community to promote government relations and effective communication between tribes and the State. WIGA aims to promote, protect, and preserve the general welfare of Indian tribes through the development of sound policies and practices with respect to the conduct of gaming activities in Indian Country. SMGHA is a governmental instrumentality of Yuhaaviatam of San Manuel Nation created for the purpose of independently carrying out the investment in, and ownership and management of, gaming and hospitality businesses outside of the San Manuel Reservation. The Amici Tribes are 17 federally recognized Indian Tribes within the meaning of the Indian Gaming Regulatory Act (“IGRA”). See 25 U.S.C. § 2703(5). Each of the Amici Tribes is a separate and distinct tribal government with the sovereign authority to conduct and regulate gaming activities on its Indian lands. The Amici Tribes all have a direct and immediate interest in maintaining their sovereign rights regarding gaming, including sports betting, on their Indian lands. Together, the Tribal Amici all have a shared, strong interest in this case because of its potential to have a significant impact on their or their member tribes’ rights regarding gaming on Indian lands, as well as Indian gaming and tribal governmental revenue as a whole. Such revenue is vital and provides funding for essential government services, tribal programs, and economic development needed to reach the goals of self-governance and self-sufficiency. ARGUMENT The Local Rules for the U.S. District Court for the District of Massachusetts do not provide the procedure for or address the propriety of amicus briefs. See generally Local Rules of

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