Here is the unpublished opinion in Hudson v. Haaland:
Briefs here.
Lower court materials here.
Hudson v. Zinke
D.C. Circuit Briefs in Hudson v. Bernhardt [MHA Nation Secretarial Election]
Here:
1878231-AppellantsFinalOpeningBrief
1878232-AppellantsFinalReplyBrief
Lower court materials here.
Oral argument audio here.
MHA Nation Member Wins Challenge to Secretarial Election Disenfranchising Off-Reservation Voters
Here are the materials in Hudson v. Zinke (D.D.C.):
Turtle Talk 