Here is the opinion in Maynes v. Unkechauge Tribal Council (E.D. N.Y.):
Maynes v. Unkechauge Tribal Council
An excerpt:
Therefore, given that the Unkechaug Nation is an Indian Nation under federal common law, it enjoys sovereign immunity. Accordingly, the Court lacks subject matter jurisdiction to adjudicate the plaintiffs’ claims and the Amended Complaint is DISMISSED WITH PREJUDICE as against the Unkechaug Nation.