Whether pendent jurisdiction permits a federal court hearing a substantial § 1983 claim against county officials to hear related state-law claims against Spokane County, a party over whom no independent basis of federal jurisdiction exists.
Holding
No. Under 28 U.S.C. § 1343(3) and 42 U.S.C. § 1983, the federal court lacked statutory authority to exercise pendent-party jurisdiction over Spokane County.
Reasoning
The Court distinguished pendent-claim jurisdiction from pendent-party jurisdiction. Under Mine Workers v. Gibbs, a federal court may hear a related state claim between parties already properly before it when the federal and state claims arise from a common nucleus of operative fact. But adding a wholly new defendant based only on a state-law claim is materially different: it extends federal power to a party who otherwise would not be in federal court.
Article III may permit the federal and state claims to be treated as one constitutional case when they arise from the same operative facts. But Article III power alone does not end the inquiry. Federal trial courts are courts of limited jurisdiction, and their jurisdiction is defined by Congress; therefore, a court must also determine whether the statute conferring jurisdiction authorizes the proposed exercise of jurisdiction over the additional party.
The precedents from Osborn through Gibbs involved nonfederal claims bound up with federal claims between parties already in federal court. The Court's ancillary-jurisdiction cases likewise did not establish a broad rule permitting plaintiffs to add new defendants whenever a related state claim shares the same facts. Many ancillary cases instead concerned claims to property or funds already under federal-court control.
Here, § 1343(3) gives district courts jurisdiction over civil actions authorized by law to redress specified civil-rights deprivations, and § 1983 supplies the relevant cause of action. At the time of this case, counties were not "persons" liable under § 1983. That exclusion meant Congress had not extended the § 1983 and § 1343 jurisdictional grant to a county such as Spokane County.
Allowing Aldinger to sue the County on a state-law claim merely because it arose from the same facts as her federal claim against the treasurer would effectively bring the County back within federal jurisdiction despite Congress's exclusion of counties from § 1983 liability. The Court read the jurisdictional statute, together with the limited scope of the federal cause of action, as an implied congressional negation of pendent-party jurisdiction in this setting.
The Court did not announce that pendent-party jurisdiction is categorically unavailable under every jurisdictional statute or procedural posture. Different statutory grants, including grants of exclusive federal jurisdiction, and different combinations of claims and parties could produce a different result. But when a new party lacks an independent federal jurisdictional basis, the court must find both Article III authority and no express or implied congressional negation of jurisdiction; that showing was not made here.