United Mine Workers of America v. Gibbs

Federal judicial power extends to state claims when a substantial federal claim and the state claim derive from a common nucleus of operative fact. If, disregarding the federal or state source of law, the claims are ones a plaintiff would ordinarily be expected to try together in one proceeding, they form a single constitutional “case” for pendent-jurisdiction purposes.

The Court rejected the narrower approach drawn from Hurn v. Oursler that required state and federal theories to be virtually identical grounds for one cause of action. Modern federal procedure favors resolving related claims together, and the relevant inquiry is whether the claims arise from the same operative events rather than whether they fit an artificial definition of a single cause of action.

Pendent jurisdiction is discretionary, not a plaintiff’s entitlement. Judicial economy, convenience, fairness, comity, the predominance of state issues, and the risk of jury confusion all bear on whether a federal court should hear the state claim. Ordinarily, state claims should be dismissed if federal claims are eliminated before trial; likewise, a court may decline jurisdiction when state issues substantially predominate.

Here, the federal and state claims arose from the same labor dispute and sought alternative forms of relief for the same alleged injury. The federal claims were substantial when pleaded and were actually submitted to the jury before later being set aside. The federal preemption question was also closely connected to the permissible scope of the state claim, giving the federal court a particular reason to retain it. Although separate theories created some risk of jury confusion, the special verdict form reduced that risk.

Federal labor law generally preempts state regulation of conduct within the National Labor Relations Act’s domain. But states retain a compelling interest in preserving domestic peace and may provide traditional tort remedies for the direct consequences of violence and imminent threats to public order during labor disputes.

That state-law exception is narrow. Prior decisions permitted recovery or injunctions only insofar as they addressed violent or threatening conduct. A state may not use the presence of some violence to regulate or impose damages for peaceful picketing that federal labor policy protects or leaves to federal regulation.

In an exceptional case, peaceful picketing may be so enmeshed with an ongoing pattern of violence that the violence or fear it creates proximately causes all resulting harm. But when the consequences of peaceful conduct and violent conduct can be separated, recovery must be confined to the harm caused by violence or threats.

The pleadings, jury arguments, and instructions did not adequately confine the Tennessee conspiracy theory to violence and threats of violence. They instead allowed the jury to treat a broader alleged conspiracy to establish UMW representation and impose UMW contract terms as the basis for liability. That approach risked imposing state-law liability for peaceful activity that federal labor law preempted.

Section 6 of the Norris-LaGuardia Act applies to state tort claims adjudicated in federal court when they arise from a labor dispute. It protects labor organizations from liability for unlawful acts of individual officers, members, or agents unless there is clear proof of the organization’s actual participation, actual authorization, or ratification after actual knowledge.

The Court construed “clear proof” to demand more than an ordinary preponderance of the evidence, though not proof beyond a reasonable doubt. The plaintiff must establish the union’s participation, authorization, or ratification by a substantial margin rather than through speculation or a tenuous inference.

The evidence did not clearly establish UMW authorization of or participation in the August 15–16 violence. Gilbert, the relevant UMW field representative, was away when it occurred, the international did not know of the company’s plan before the violence, and the record contained only sketchy evidence connecting the international union to the initial acts.

Nor did the UMW’s later involvement in the strike establish ratification. A union does not ratify prior violence merely by performing normal strike functions, providing strike relief, continuing lawful picketing, or declining to issue a formal repudiation. National labor policy encourages international unions to take control of volatile disputes and restrain local members without thereby becoming liable for misconduct already committed.

The evidence showed that the UMW instructed Gilbert to suppress violence, limit the picket line, and prevent the dispute from spreading, and that he did so. Although the UMW used peaceful pressure to oppose Gibbs’s role in opening the mine with a rival union, there was no clear proof that it approved the earlier violence, knowingly tolerated later actionable violence, or deliberately relied on the fear created by the initial violence. For peaceful activity, Gibbs’s possible remedy was limited to § 303, not state tort damages.