NLRB Reinstates General Motors Framework in Lion Elastomers III: A Major Shift for Employer Discipline and Workplace Conduct Standards

WASHINGTON — In a significant legal development for labor relations and employment law, the National Labor Relations Board (NLRB or Board) issued its decision in Lion Elastomers LLC, 375 NLRB No. 41 (2026) (Lion Elastomers III). Delivered on September 23, 2026, the ruling brings welcome clarity—and a decidedly more employer-friendly standard—to the complex question of when an employee’s abusive, profane, or otherwise inappropriate conduct during protected activity crosses the line and loses the protection of the National Labor Relations Act (NLRA).

By formally acknowledging that the Wright Line burden-shifting test—originally re-embraced in the Board’s 2020 General Motors decision—remains the controlling legal framework, the NLRB has effectively discarded the more employee-friendly, setting-specific standards that were briefly revived in 2023 under Lion Elastomers II.

This comprehensive report examines the core facts of the decision, the convoluted procedural history that led to the Fifth Circuit’s intervention, the mechanics of the competing legal frameworks, official reactions and Board commentary, and the practical implications for employers navigating workplace discipline.

Main Facts of the Case

At the center of Lion Elastomers III is a familiar tension in labor law: balancing an employee’s statutory right to engage in union activity and protected concerted action under Section 7 of the NLRA against an employer’s fundamental duty to maintain a safe, orderly, and respectful workplace.

When an employee engages in heated discourse, insubordination, or offensive language while participating in a safety meeting, organizing campaign, or grievance procedure, employers face a difficult dilemma. Disciplining or terminating the worker risks an unfair labor practice (ULP) charge if the conduct is deemed part and parcel of the protected activity. Conversely, failing to address abusive behavior undermines management authority and can expose the organization to liability for failing to curb hostile or intimidating workplace behavior.

For years, the standard for evaluating whether misconduct severed the protections of the NLRA depended heavily on the political composition of the NLRB, leading to starkly shifting legal pendulums. The Lion Elastomers litigation became the prime vehicle for this multi-year jurisdictional tug-of-war between the Board and the United States Court of Appeals for the Fifth Circuit.

Chronology of the Legal Battle: A Multi-Year Procedural Odyssey

To understand the weight of Lion Elastomers III, one must examine the protracted procedural path that necessitated the Board’s September 2026 action.

1. Lion Elastomers I and the Advent of General Motors

The dispute began when Lion Elastomers disciplined and discharged an employee who raised safety concerns during a company meeting and actively engaged in union activities. Initially, the NLRB (Lion Elastomers I) found that the employer violated the NLRA by penalizing the worker. In doing so, the Board relied on decades-old, setting-specific standards that heavily favored protecting employees even when their behavior became offensive or heated during Section 7 activities.

Shortly after handing down Lion Elastomers I, the Board shifted gears in a separate landmark case, General Motors Corp. (2020). In General Motors, the Board discarded the fragmented setting-specific tests in favor of the unified Wright Line burden-shifting framework for evaluating employee misconduct occurring during protected activity. Recognizing this legal evolution, the Board sought a voluntary remand, and the U.S. Court of Appeals for the Fifth Circuit sent Lion Elastomers I back to the Board so it could be re-evaluated under the newly minted General Motors framework.

2. The Reversal: Lion Elastomers II (2023)

Rather than applying General Motors to the facts of the case on remand—as the Fifth Circuit had implicitly expected—the NLRB reversed course entirely. In its 2023 decision, Lion Elastomers II, the Board formally overruled General Motors. It resurrected the older, setting-specific doctrines, thereby re-establishing broad legal protections for employees who utilized offensive, profane, or abusive behavior while exercising their statutory rights.

3. The Fifth Circuit Steps In: Vacatur and Due Process (2024)

Dissatisfied with the Board’s abrupt about-face, Lion Elastomers once again petitioned the Fifth Circuit for review. In 2024, the federal appellate court decisively vacated the Board’s decision in Lion Elastomers II.

The Fifth Circuit held that the NLRB had severely exceeded the scope of the court’s initial remand by refusing to apply General Motors to the pending dispute. Furthermore, the court sharply rebuked the Board for overturning a major precedent (General Motors) without giving the employer adequate notice or an opportunity to be heard on the merits of the issue—a clear violation of the employer’s due process rights. Consequently, the Fifth Circuit remanded the case again, instructing the Board to properly apply General Motors.

4. Resolution: Lion Elastomers III (September 2026)

Complying with the mandate of the Fifth Circuit, the NLRB issued Lion Elastomers III on September 23, 2026. The Board formally acknowledged that the appellate court’s vacatur of Lion Elastomers II automatically restored the General Motors/Wright Line framework as extant, controlling Board precedent.

Supporting Data and Legal Frameworks: Wright Line vs. Setting-Specific Standards

The practical difference between these two legal frameworks cannot be overstated, as each imposes vastly different burdens of proof on employers and litigants.

The General Motors / Wright Line Framework (Employer-Favorable)

Under the Wright Line burden-shifting test—which now governs once more—the legal inquiry is structured to prevent employers from using protected activity as a mere pretext for anti-union animus, while simultaneously protecting management’s right to enforce workplace rules:

1. General Counsel’s Burden: The NLRB’s General Counsel must first establish by a preponderance of the evidence that the employee engaged in protected concerted activity, that the employer knew of this activity, and that the protected activity was a substantial or motivating factor in the employer’s decision to discipline or discharge the employee.
2. Employer’s Affirmative Defense: Once the General Counsel meets this initial burden, the burden shifts to the employer. The employer can completely avoid liability by demonstrating—by a preponderance of the evidence—that it would have taken the exact same disciplinary action even in the absence of the protected activity (typically by showing consistent enforcement of neutral workplace conduct or civility rules against non-unionized or non-protesting employees).

The Setting-Specific Standards (Employee-Favorable)

By contrast, the doctrines revived temporarily in Lion Elastomers II looked intensely at the specific context in which the misconduct occurred. These legacy frameworks categorized workplace misconduct into distinct settings—such as picket lines, workplace meetings, or discussions with management—and applied different thresholds of tolerance for bad behavior in each arena.

Under these setting-specific rules, employees who used profanity, engaged in insubordination, or made heated outbursts were frequently shielded from discipline simply because their misconduct arose during the course of exercising Section 7 rights. This made it exceedingly difficult for employers to discipline workers whose behavior crossed professional boundaries, provided a nexus to protected activity existed.

Official Responses and Board Commentary

The release of Lion Elastomers III drew immediate attention from labor law practitioners, corporate counsel, and labor organizations alike.

In the majority opinion, the Board emphasized that the legal reality was dictated by the federal judiciary. The NLRB noted that it was "impossible to reconcile" the Fifth Circuit’s holding—which found that the Board exceeded its authority by trying to overrule General Motors—with any notion that General Motors remained dead. The Board explicitly clarified that it was the Fifth Circuit’s judicial mandate, rather than a voluntary internal policy shift by the Board, that invalidated the legal alterations attempted in Lion Elastomers II.

Adding important nuance to the ruling, NLRB Chairman Murphy authored a concurring opinion. Chairman Murphy underscored that the current Board did not formally vote to overrule precedent through this specific decision, but rather recognized the unavoidable legal effect of the Fifth Circuit’s binding mandate.

Significantly, the Board inserted a caveat regarding future litigation. The agency noted that if and when a future case properly litigates the question of whether to overrule General Motors through appropriate administrative channels, "nothing in this decision or in the court’s remand will preclude consideration of that issue." This signals that while the Wright Line standard is back in the driver’s seat for now, the ideological war over workplace civility standards at the NLRB is far from permanently settled.

Practical Implications for Employers

For human resources professionals, in-house counsel, and labor relations specialists, Lion Elastomers III provides a welcomed, albeit cautious, return to predictability.

1. Re-centering Discipline on Neutral Standards

With the General Motors/Wright Line framework reinstated as controlling precedent, employers dealing with employee misconduct during protected concerted activities no longer have to navigate a confusing maze of setting-specific exceptions. Instead, employers can return to a familiar analytical approach: evaluating whether the disciplinary action would have been identical regardless of whether the employee was engaging in union organizing, safety complaints, or concerted protests.

2. The Critical Importance of Consistency

To successfully utilize the Wright Line defense under the restored framework, employers must anchor their disciplinary decisions in solid, verifiable evidence of consistent policy enforcement.

• Did the employee violate a clearly communicated, neutral workplace conduct or anti-harassment policy?
• Has the company historically disciplined other employees—regardless of their union status or involvement in protected activity—for similar outbursts, profanity, or insubordination?

If an employer can demonstrate a consistent track record of penalizing identical misconduct across the board, the risk of a successful ULP charge under the restored framework drops significantly.

3. Caution and Future Uncertainty

Despite the favorable immediate outcome, legal experts advise employers not to interpret Lion Elastomers III as a blank check to discipline workers who engage in heated rhetoric during labor disputes. Because the Board explicitly noted that future challenges to General Motors remain legally possible under a shifting political landscape, caution is paramount.

Employers are strongly advised to:

• Carefully evaluate the factual context of any disciplinary action involving employees engaged in Section 7 activities.
• Ensure that investigations into employee misconduct are thoroughly documented, objective, and well-supported by eyewitness accounts or digital records.
• Consult with legal counsel before administering severe discipline—such as termination or suspension—to employees who exhibit offensive or insubordinate behavior during protected concerted activities.

As labor dynamics continue to evolve at both the administrative and appellate levels, monitoring further NLRB pronouncements and court decisions will remain essential for maintaining compliant and orderly workplaces.