Glacier Northwest, Inc. v. Teamsters
The Supreme Court ruled that a concrete company's state-court lawsuit against its drivers' union can proceed, holding that federal labor law does not protect a union that deliberately times a strike to destroy the employer's property and endanger its equipment.
The decision draws a line between lawful strike activity — even when it causes economic harm — and strike conduct specifically designed to damage an employer's physical property, with the latter falling outside federal labor law's shield.
How it got here: The Washington trial court dismissed Glacier's claims; an intermediate appeals court reversed; the Washington Supreme Court reinstated the dismissal; the U.S. Supreme Court agreed to hear the case.
The Case in Depth
What happened
Glacier Northwest is a concrete delivery company in Washington State whose truck drivers were represented by the Teamsters union. After the parties' collective-bargaining agreement expired and negotiations broke down, the union called a strike on a morning when drivers had already loaded their trucks with freshly mixed concrete — a highly perishable material that hardens quickly and can destroy a truck's drum if left to set. At least sixteen drivers returned with full loads; nine abandoned their trucks without telling anyone. Glacier scrambled to offload the concrete before it hardened, saving the trucks but losing all the concrete it had mixed that day.
The question before the Court
Can a concrete company sue a union in state court for intentionally destroying its property during a strike, or does federal labor law block such lawsuits?
The Court's answer
No — federal labor law did not shield the union from Glacier's state lawsuit. The National Labor Relations Act protects the right to strike, but that right has limits. Both parties agreed that under long-standing rules of the National Labor Relations Board, the NLRA does not protect striking workers who fail to take "reasonable precautions" to shield their employer's property from foreseeable, serious, and imminent danger caused by their sudden work stoppage.
The Court found the union failed that test entirely. It knew the concrete was highly perishable, knew loaded trucks would suffer serious damage if drivers walked off, and yet coordinated the strike precisely when trucks were fully loaded — apparently to maximize harm. Because such conduct is not even "arguably protected" by federal labor law, the Garmon doctrine (which normally requires state courts to stand aside and let the NLRB resolve the dispute first) did not apply, and Glacier's tort claims could move forward in state court.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Companies in industries that handle perishable materials, hazardous chemicals, or time-sensitive products can now sue a union in state court if the union strategically times a strike to cause property damage rather than just economic loss. Unions organizing workers in those industries face greater legal exposure when planning work stoppages and must be careful to take steps to protect the employer's equipment when walking off the job.
What changes now
The case returns to Washington state courts, which will decide whether the union is actually liable under state tort law for conversion and trespass to chattels. Separately, after the Washington Supreme Court ruled, the NLRB's General Counsel filed an unfair labor practice complaint against Glacier, alleging it unlawfully retaliated against drivers for striking. The Supreme Court left it entirely to the Washington courts on remand to decide whether that pending Board proceeding changes the Garmon analysis — a question the majority explicitly did not address.
What this does not decide
The ruling does not decide whether the union actually violated state tort law — only that federal law does not block the lawsuit at the threshold. The Court also expressly left open whether the NLRB General Counsel's pending complaint against Glacier automatically requires the state court to pause the case. The majority did not reconsider or scale back the Garmon preemption doctrine itself.
Concurrences and dissents
Concurrence — Justice Thomas
Justice Thomas agreed the tort claims should not be preempted, but wrote separately to criticize the Garmon doctrine as fundamentally at odds with ordinary preemption principles, which require a clear conflict between federal and state law. He argued that Garmon hands control over state-court jurisdiction to the NLRB's evolving case law rather than to the NLRA's text, and called on the Court to reexamine the doctrine in a future case.
Concurrence — Justice Alito
Justice Alito would have resolved the case on simpler grounds: decades of Supreme Court precedent already establish that the NLRA does not protect workers who intentionally destroy their employer's property. There was no need to analyze the NLRB's 'reasonable precautions' doctrine — those older cases directly controlled and showed the union's alleged conduct was plainly unprotected.
Dissent — Justice Jackson
Justice Jackson argued the majority should never have reached the merits. After the Washington Supreme Court ruled, the NLRB General Counsel filed a complaint concluding the union's strike conduct was protected — which in her view automatically triggers Garmon's requirement that courts stand down. She also argued that even on the merits the majority misapplied the Board's 'reasonable precautions' doctrine, using bare allegations from the employer's complaint to answer fact-intensive questions that Congress assigned to the Board, risking erosion of the right to strike.
How the Court got there
The legal reasoning, step by step
- The applicable legal framework is 'Garmon preemption,' named after a 1959 Supreme Court decision. Under Garmon, state courts must pause labor-related lawsuits and let the National Labor Relations Board resolve the dispute first whenever the conduct being sued over is even 'arguably' protected by the NLRA. The burden falls on the party claiming preemption — here the union — to show the conduct clears that bar.
- The Court identified an undisputed limit on the right to strike: the NLRA does not protect workers who fail to take 'reasonable precautions' to prevent foreseeable, serious, and imminent harm to the employer's property when they suddenly stop working. Both the union and Glacier accepted this principle, drawn from decades of NLRB decisions.
- Accepting Glacier's complaint as true — as courts must at the early dismissal stage — the Court concluded the union had not taken reasonable precautions. The union knew concrete is highly perishable, that hardening concrete destroys a truck's drum, and that drivers had fully loaded trucks that morning. It nevertheless triggered the walkout at that precise moment.
- The Court rejected the union's argument that this was simply a case of perishable goods being lost — a risk the NLRA accepts. The drivers first reported for work and prompted the concrete to be mixed and loaded, then walked off only after the trucks were full, putting Glacier's trucks — not just the concrete — in immediate danger. The majority treated this as deliberately engineering the harm, not merely accepting it as a byproduct of a lawful strike.
- Because the union took affirmative steps to endanger Glacier's property rather than minimal precautions to reduce the risk, its conduct was not 'arguably protected' by the NLRA. The Garmon test was therefore not satisfied, the state court should not have dismissed the tort claims as preempted, and the lawsuit can proceed.
Doctrinal impact
Cases affected by this decision
Reaffirms San Diego Building Trades Council v. Garmon (359 U. S. 236)
The Garmon 'arguably protected' test still governs when federal labor law displaces state tort claims over strike conduct.
Reaffirms Longshoremen v. Davis (476 U. S. 380)
The party claiming NLRA preemption must show more than a conclusory assertion that the conduct is arguably protected.