Amicus Curiae Cannot Appeal Without Rule 24 Intervention: Jurisdictional Bar to Challenging a Successor Consent Decree

Case: United States v. State of Mich. (6th Cir. Mar. 11, 2025) (unpublished; “NOT RECOMMENDED FOR PUBLICATION”)
Appeals: Nos. 23-1944 / 23-1971
Core Holding: A non-party appearing only as amicus curiae lacks appellate standing to challenge entry of a consent decree; absent a timely motion to intervene under Fed. R. Civ. P. 24, the court of appeals lacks jurisdiction—regardless of robust participation in district-court objections.

1. Introduction

This appeal arose from long-running federal litigation governing allocation, management, and regulation of Great Lakes fishing in Michigan waters. In December 2022, the United States, the State of Michigan, and several tribes (the “Stipulating Parties”) submitted a proposed successor consent decree—the “2023 Great Lakes Fishing Decree” (“2023 Decree”)—intended to replace the prior “2000 Decree” after years of negotiations.

The Coalition to Protect Michigan Resources (the “Coalition”), a nonprofit representing recreational fishing and conservation interests, participated as amicus curiae and lodged eleven objections. The district court overruled the objections and entered the 2023 Decree. The Coalition then noticed an appeal. The United States filed a cross-appeal confined to whether the Coalition had any right to appeal.

The Sixth Circuit did not reach the merits of the fishery-management objections. Instead, it treated the dispute as a threshold question of appellate jurisdiction: whether an amicus curiae—never granted intervention—may appeal the entry of a consent decree.

2. Summary of the Opinion

The Sixth Circuit dismissed the Coalition’s appeal for lack of appellate jurisdiction and dismissed the United States’s cross-appeal as moot. The dispositive fact was procedural: the Coalition “failed to file a motion to intervene in the first instance” and therefore never became a party. Under controlling Supreme Court and Sixth Circuit precedent, only parties may appeal adverse final judgments (with narrow exceptions not applicable here).

The court rejected the Coalition’s attempts to recharacterize itself as a “de facto party” based on its extensive participation and the district court’s consideration of its objections. Participation as an amicus—even active participation—does not substitute for intervention under Rule 24.

3. Analysis

3.1. Precedents Cited (and How They Shaped the Holding)

  • Marino v. Ortiz, 484 U.S. 301 (1988)
    The cornerstone authority for the “party-only appeal” rule. The Supreme Court held that non-parties who failed to intervene “may not appeal from the consent decree” approving settlement. The Sixth Circuit used Marino to frame the Coalition’s posture as jurisdictionally fatal: objections and hearing participation do not create appellate standing absent intervention.
  • Bender v. Williamsport Area School District, 475 U.S. 534 (1986)
    Reinforced that intervention requires a “timely application” by appropriate motion under Fed. R. Civ. P. 24(a), (c). The Sixth Circuit analogized: just as the would-be appellant in Bender could not appeal without intervening, an amicus cannot “circumvent a threshold jurisdictional requirement.”
  • Stringfellow v. Concerned Neighbors in Action, 480 U.S. 370 (1987)
    Cited for the general proposition that a non-party becomes a party for appeal purposes through intervention—underscoring intervention as the recognized gateway to appellate standing.
  • United States v. Michigan, 424 F.3d 438 (6th Cir. 2005)
    Provided the Sixth Circuit’s four-factor test for intervention as of right and the requirement that failure on any factor defeats intervention. It also supported the panel’s characterization that the Coalition was “invited” to file an appropriate, renewed motion in the future—but did not.
  • Grubbs v. Norris, 870 F.2d 343 (6th Cir. 1989)
    Cited for the burden on the proposed intervenor to prove each element of intervention as of right and the necessity of denial if all are not met—reinforcing that intervention is not informal or discretionary in the sense the Coalition suggested.
  • Buck v. Gordon, 959 F.3d 219 (6th Cir. 2020) and Fed. R. Civ. P. 24(b)
    Supplied the permissive-intervention standards—timeliness, common question, and undue delay/prejudice—highlighting that even permissive intervention requires a motion and a rule-based showing.
  • City of Cleveland v. Ohio, 508 F.3d 827 (6th Cir. 2007)
    The Coalition relied on the dictum that “appeals may be taken by non-parties who were treated on all sides as de facto parties.” The panel distinguished it sharply: the City was already a party to the overall case and central to the controversy; by contrast, the Coalition “was never a party to the action at all” and had consistently been limited to traditional amicus status.
  • Devlin v. Scardelletti, 536 U.S. 1 (2002)
    Recognized a narrow exception allowing certain nonnamed class members to appeal settlement approval without intervening in a mandatory Rule 23(b)(1) class action because they are “bound by the settlement.” The panel held Devlin inapplicable: no class was certified, and the 2023 Decree bound sovereign parties (tribes, state, United States), not the Coalition as a member of the public.
  • U.S. ex rel. Eisenstein v. City of New York, 556 U.S. 928 (2009)
    Cited to limit Devlin to the “class-action nature of the suit,” supporting the Sixth Circuit’s refusal to extend Devlin to amici objecting to a consent decree.
  • Hispanic Society of New York City Police Department Inc. v. New York City Police Department, 806 F.2d 1147 (2d Cir. 1986), aff’d sub nom. Marino v. Ortiz, 484 U.S. 301 (1988)
    Particularly influential because it rejected the same move attempted here: arguing that filing written objections and presenting oral argument effectively made objectors “parties.” The Sixth Circuit treated this as a near-direct refutation of the Coalition’s “treated like a party” theory.
  • United States v. Michigan, 940 F.2d 143 (6th Cir. 1991)
    Provided the Sixth Circuit’s institutional caution against “litigating amicus curiae.” Quoted to reiterate that amici cannot be elevated to “named party/real party in interest” or conferred intervenor authority without complying with Rule 24(a). The panel used this precedent to reject any “judicial legerdemain” that would bypass the Federal Rules.
  • Donaldson v. Lyon, 2021 WL 1625413 (6th Cir. Feb. 16, 2021)
    A Sixth Circuit example of dismissing an appeal where appellants never became parties or intervenors—confirming the court’s consistent practice.
  • City of Cleveland v. Ohio, 508 F.3d 827 (6th Cir. 2007) (also) and In re Associated Press, 162 F.3d 503 (7th Cir. 1998)
    Cited for the principle that a would-be intervenor who unsuccessfully moves to intervene generally may appeal only the denial of intervention (not merits orders).
  • Broidy Cap. Mgmt. LLC v. Muzin, 61 F.4th 984 (D.C. Cir. 2023)
    Quoted for the systemic rationale: the party-only appeal rule supplies “structure and order” essential to the administration of justice, underscoring the holding as jurisdictional and institutional, not merely formalistic.

3.2. Legal Reasoning

The court’s reasoning proceeds in three steps:

  1. Jurisdictional premise: “Generally, only parties to an action have standing to appeal.” The appellate court treats this as a hard gatekeeping rule tied to jurisdiction, not a waivable prudential concern.
  2. Intervention as the exclusive pathway for non-parties: A non-party may become a party for appeal purposes by intervening under Fed. R. Civ. P. 24. The Coalition did not file a motion to intervene in connection with the entry of the 2023 Decree and did not attempt to satisfy the intervention standards.
  3. Rejection of attempted exceptions:
    • De facto party theory fails because (a) the Coalition had been repeatedly denied intervention historically, (b) the district court repeatedly characterized it as “traditional amicus,” and (c) the “de facto party” language in City of Cleveland v. Ohio concerned a litigant already central and effectively a party to the controversy.
    • Devlin v. Scardelletti exception fails because this is not a class action and the Coalition is not “bound” by the decree in the way class members are bound.
    • Participation-by-objection fails because Hispanic Society of New York City Police Department Inc. v. New York City Police Department (affirmed by Marino v. Ortiz) holds that objection participation does not confer party status.
    • Any suggestion that the district court could “grant” a right to appeal is ineffective: appellate jurisdiction is governed by status and rules, not by a district court’s permissive framing.

The court also addressed (and rejected) the idea that its own prior language in United States v. Michigan, 68 F.4th 1021 (6th Cir. 2023), implied authorization for appeal without intervention. The panel read that decision as inviting a future “request intervention” motion—not as exempting compliance with Rule 24.

3.3. Impact

  • Reaffirms a bright-line jurisdictional rule for amici: Even substantial participation (multiple objections, oral argument, proposed findings) does not create appellate standing. Organizations that anticipate the need to appeal must pursue intervention in a procedurally proper manner.
  • Constrains “litigating amicus” practice in complex remedial cases: Long-running consent-decree governance regimes often welcome stakeholder input through amici. This decision warns district courts and amici that accommodating participation cannot morph into appellate rights without Rule 24.
  • Narrows practical reliance on “de facto party” rhetoric: The Sixth Circuit signals that City of Cleveland v. Ohio is exceptional, fact-bound, and unlikely to extend to amici—especially where prior intervention attempts were denied and the entity was expressly limited to “traditional amicus” status.
  • Separates “public interest” from “party status”: The Coalition’s biodiversity and conservation interests, though substantively important, do not substitute for the procedural predicate needed to invoke appellate jurisdiction.

4. Complex Concepts Simplified

  • Appellate jurisdiction: The court of appeals’ legal power to hear a case. If the would-be appellant lacks standing to appeal (because it is not a party), the appellate court must dismiss without reaching the merits.
  • Amicus curiae (“friend of the court”): A non-party allowed to provide information or argument to assist the court. Amicus status is typically “non-adversarial” and does not carry party rights like controlling claims, demanding relief, or appealing.
  • Intervention (Rule 24): The formal mechanism for a non-party to become a party. It can be “as of right” (meeting specific criteria) or “permissive” (discretionary), but either way it requires a timely motion and compliance with rule requirements.
  • “De facto party”: A narrow, exceptional concept applied where an entity, though not formally intervened, was effectively treated as a party on all sides and is central to the controversy. This opinion treats that as inapplicable to a traditional amicus in a consent-decree proceeding.
  • Devlin class-member exception: In some class actions, nonnamed class members are sufficiently “bound” by a settlement that they may appeal approval without intervention. This case emphasizes that the exception does not generalize to non-class amici.

5. Conclusion

The Sixth Circuit’s decision establishes (and strongly reasserts) a practical rule for consent-decree and institutional-reform litigation: an amicus curiae cannot appeal entry of a decree without first intervening under Fed. R. Civ. P. 24. Neither extensive participation in objections nor a district court’s apparent willingness to entertain appellate review can supply missing party status. The opinion thus channels stakeholder challenges into the formal intervention framework and preserves the party-based structure of appellate review.