Not sure what tribe is involved, but this case (United States v. Tarlow Realty, Inc.)  involves the government’s efforts to shut down a waste disposal unit on an Indian trust allotment. It succeeded. Of note, the unpublished opinion offers this commentary about the potential conflict of interest demonstrated by the government:

Finally, we note that the Government instigated this suit at the behest of two different federal agencies — the EPA and the BIA — and that it thus represents both the general public and the allottees, whose interests may diverge in some respects. Congress permits the Government to serve dual advocacy roles as environmental steward and allotment trustee, see Nevada, 463 U.S. at 128, 135 n.14, but the Government’s focus in this case on the former, with little evident regard for the latter, raises some concern. The statutory scheme governing third-party commercial use of allotted land places the Government, in its capacity as landowner and trustee, in the paternalistic position of sanctioning only those land uses which strike an appropriate balance between economic development for the allottees and the impact of that development on the environmental health and safety of the allotment property and surrounding community. See 25 U.S.C. §§ 348, 415(a); Segundo v. City of Rancho Mirage, 813 F.2d 1387, 1393 (9th Cir. 1987); Yavapai-Prescott Indian Tribe v. Watt, 707 F.2d 1072, 1074-75 (9th Cir. 1983); United States v. S. Pac. Transp. Co., 543 F.2d 676, 698, 699 (9th Cir. 1976). In litigating this case, the Government has vigorously pursued its role as advocate for the environment and the general public, and admirably so, but it may have given shorter shrift to its role as representative of the economic interests of the allottees. In fact, nowhere in the record or the Government’s brief is there a discussion of how and whether this litigation serves the allottees’ welfare. We suspect that enjoining further operation of the waste disposal facility and redeveloping the property probably does serve their long-term economic interests, but the Government’s failure to so much as mention its obligation in this regard leaves the impression, right or wrong, that it may have eschewed this duty altogether. Nevertheless, while in different circumstances that might have affected the outcome, in this case we are satisfied that the Government did not act in excess of its authority.