## Facts

- In spring 1960, Tennessee Consolidated Coal Company shut down one of its Tennessee mines and laid off about 100 miners who belonged to United Mine Workers of America (UMW) Local 5881.
- Later that summer, Grundy Company, a Tennessee Consolidated subsidiary, opened a nearby mine and staffed many positions with members of the Southern Labor Union rather than the UMW local.
- Grundy gave Paul Gibbs a contract to haul coal from the mine to the railroad (and, in connection with the start-up, Gibbs also served as a superintendent-type manager for the operation).
- Shortly after operations began, members of the UMW local sought to stop the new mine from operating, believing the jobs had been promised to them.
- UMW members prevented work from occurring and, at times, used or threatened physical violence against workers connected with the new mine.
- Gibbs lost his hauling work and claimed the union’s actions made it impossible for him to obtain other hauling jobs in the area.
- Gibbs sued the UMW’s international union in federal court, alleging (1) a federal cause of action under LMRA § 303 (for certain prohibited secondary activity) and (2) Tennessee common-law claims (including conspiracy and interference with contractual and business relations), seeking compensatory and punitive damages.
- A jury returned a verdict for Gibbs on both the federal and state theories and awarded damages.
- The trial court ultimately set aside the damages award on the federal § 303 claim but allowed recovery on the state-law theory (with adjustments), and the court of appeals affirmed that disposition.
- The Supreme Court granted review to address pendent jurisdiction and federal labor-law preemption of the state tort claims.

## Issues

1. When a plaintiff pleads a substantial federal claim, what constitutional standard permits a federal court to hear related state-law claims in the same suit (pendent jurisdiction)?
2. Even if Article III permits pendent jurisdiction, what considerations govern whether the federal court should exercise it?
3. To what extent are Tennessee tort claims based on union conduct during a labor dispute preempted by federal labor law, particularly where some conduct involves violence and some involves peaceful picketing and pressure?
4. If the federal claim fails on the merits, may the federal court nonetheless proceed to judgment on the related state claim, and what limits apply?

## Decision

- The Court held that Article III permits pendent jurisdiction where the federal claim is substantial and the state and federal claims arise from a “common nucleus of operative fact” such that a plaintiff would ordinarily expect to try them in one proceeding.
- The Court held that pendent jurisdiction is discretionary, not automatic; courts weigh judicial economy, convenience, fairness to the parties, and respect for state courts, and should avoid deciding state-law questions when the federal basis for the case drops out early.
- The Court concluded that state tort remedies are not displaced to the extent the union conduct at issue involves violence or threats of violence; states may provide relief for such conduct even when it occurs in a labor dispute.
- The Court also concluded that state-law liability may be preempted to the extent it rests on peaceful union activity that is arguably protected or prohibited by the National Labor Relations Act, because that area is generally committed to federal labor policy and the National Labor Relations Board.
- Because the jury’s state-law verdict and damages could have been based in part on preempted peaceful conduct (and the record did not clearly separate damages attributable solely to violence), the Court did not allow the state judgment to stand as entered and required further proceedings consistent with the preemption limits.
- Disposition: affirmed in part and reversed in part, and the case was remanded for proceedings consistent with the Court’s pendent-jurisdiction and preemption rulings.

## Legal Principles

- A federal court may hear state-law claims with a federal claim when the federal claim is substantial and the claims share a “common nucleus of operative fact” such that they form one constitutional “case.”
- Pendent jurisdiction is a matter of judicial discretion; relevant considerations include economy, convenience, fairness, and comity, including avoiding unnecessary state-law decisions.
- When the federal claim is dismissed before trial, the related state claims ordinarily should be dismissed as well; after substantial federal-court proceedings, retaining state claims may still be appropriate depending on the circumstances.
- Federal labor law generally preempts state regulation of conduct that is arguably protected or prohibited by the NLRA, but state tort remedies for violence, intimidation, and similar misconduct are not barred merely because the setting is a labor dispute.
- Where a verdict may rest on both preempted (peaceful, arguably NLRA-governed) conduct and non-preempted (violent) conduct, the judgment cannot stand unless damages and liability are limited to the non-preempted portion.

## Conclusion

United Mine Workers of America v. Gibbs held that federal courts may hear related state-law claims with a substantial federal claim when both arise from a common nucleus of operative fact, but that exercising such jurisdiction is discretionary. The Court also held that federal labor law does not preempt state tort recovery for union violence and threats, while it can preempt liability based on peaceful conduct arguably governed by the NLRA; because the jury’s state-law verdict could have rested on preempted conduct, the Court required further proceedings on remand consistent with those limits.


United Mine Workers of America v. Gibbs, 383 U.S. 715, 86 S. Ct. 1130, 16 L. Ed. 2D 218 (1966)