What Is Unfair Labor Practice?

A ULP strike is called in response to an employer’s unfair labor practice; an economic strike is called to pressure an employer during bargaining over wages or working conditions.

Unfair Labor Practice (ULP) — An unfair labor practice is any action by an employer or labor union that violates rights protected under Section 8 of the National Labor Relations Act (NLRA). ULPs cover interference with organizing, discriminatory treatment tied to union activity, refusal to bargain in good faith, and union coercion of employees. The NLRB investigates, prosecutes, and remedies ULP charges.

NLRA section 8: what the law actually prohibits

Section 8 of the NLRA (29 U.S.C. Section 158) divides ULP prohibitions into two tracks: Section 8(a) governs employer conduct, Section 8(b) governs labor organization conduct. Both tracks protect the Section 7 rights of employees — the right to organize, form or join unions, bargain collectively, and engage in other concerted activities for mutual aid or protection.

Section 8(a): five employer prohibitions

8(a)(1) — Interference, restraint, or coercion. Employers cannot interfere with employees exercising Section 7 rights. This is the broadest prohibition and serves as a catch-all: a violation of any other 8(a) subsection is automatically also a violation of 8(a)(1). Prohibited conduct includes threatening plant closures or benefit cuts during organizing, interrogating employees about union sympathies, and surveilling union activity.

8(a)(2) — Employer domination of a labor organization. Employers cannot create, dominate, finance, or assist a labor organization. This bars company unions — employer-controlled groups that simulate collective bargaining without independent employee representation.

8(a)(3) — Discrimination based on union activity. Employers cannot discharge, discipline, lay off, or refuse to hire employees because of union membership or protected concerted activity. The NLRB’s Wright Line test applies: if union activity was a motivating factor in an adverse action, the burden shifts to the employer to prove the same action would have occurred regardless.

8(a)(4) — Retaliation for NLRB participation. Employers cannot discharge or otherwise discriminate against employees who file ULP charges or give testimony in NLRB proceedings. This protects the integrity of the enforcement process itself.

8(a)(5) — Refusal to bargain in good faith. Once a union is certified, employers must bargain collectively and in good faith over wages, hours, and other mandatory subjects of bargaining. Unilateral changes to terms and conditions of employment — without notice or bargaining — are the most common 8(a)(5) violations in enterprise settings.

Section 8(b): six union prohibitions

Unions face a parallel set of prohibitions under 8(b), including coercing employees into union membership (8(b)(1)(A)), causing employers to discriminate against employees for union-related reasons (8(b)(2)), refusing to bargain in good faith (8(b)(3)), engaging in secondary boycotts (8(b)(4)), charging excessive initiation fees (8(b)(5)), and featherbedding — requiring payment for services not performed (8(b)(6)).

Unfair labor practice examples: employer vs. union

How to file a ulp charge: the NLRB process

Any person — employee, employer, or union — can file a ULP charge with the NLRB. The process follows a defined sequence with enforceable deadlines. The NLRB’s official process chart maps every stage from filing through enforcement.

Step 1: file NLRB form 508 (or form 501) within 6 months

The statute of limitations is strict: charges must be filed within six months of the alleged ULP. Use NLRB Form 501 to charge an employer; use NLRB Form 508 to charge a labor organization. File electronically via the NLRB’s e-filing portal (fastest) or at the regional office covering the location where the alleged violation occurred.

Step 2: NLRB regional office investigation (approx. 7-10 weeks)

A Board agent conducts a neutral investigation. The respondent must respond within 10 days of receiving the charge. The Regional Director then issues one of three decisions: (1) dismiss the charge, (2) facilitate a pre-complaint settlement, or (3) issue a formal complaint and schedule a hearing before an Administrative Law Judge (ALJ).

Step 3: alj hearing and remedies

If the case proceeds to hearing, an ALJ rules on the charge. Appeals go to the full NLRB Board, then to the U.S. Court of Appeals. Remedies are primarily make-whole: reinstatement, back pay, restoration of benefits, and mandatory Notice to Employees posting. In severe cases the Board may issue a Gissel bargaining order — requiring the employer to recognize and bargain with the union without an election.

Penalties and remedies

The NLRA does not include punitive damages. Remedies are restorative:

• Back pay and interest — calculated from the date of the violation to the date of reinstatement or offer of reinstatement
• Reinstatement — including expungement of disciplinary records tied to the violation
• Cease-and-desist order — enjoining continued or similar conduct
• Notice posting — required 60-day posting of NLRB-approved notice informing employees of their rights and the violation
• Bargaining order (Gissel) — reserved for egregious or pervasive violations that make a fair election impossible

SHRM estimates that contested ULP cases average 18-24 months from charge to final resolution. For enterprise employers, the indirect costs — manager time in investigation, legal fees, and reputational exposure — consistently exceed the direct liability.

Employer response strategy when a ulp charge is filed

A ULP charge is not a finding of guilt. Enterprise HR teams should execute a structured response protocol:

1. Preserve all records immediately. Suspend routine deletion schedules. Collect communications, performance records, and scheduling data related to the alleged violation and the employee(s) named.
2. Engage labor counsel within 24 hours. The NLRB investigation is adversarial once a complaint is issued. Early counsel involvement shapes the investigation strategy.
3. Respond factually to the regional office. Provide the Board agent with accurate, documented facts. Misrepresentations compound liability.
4. Evaluate settlement early. The NLRB settles approximately 90% of meritorious charges before ALJ hearing. Early settlement typically limits liability and avoids precedent-setting rulings.
5. Audit manager conduct prospectively. Identify whether the alleged conduct reflects a systemic training gap and correct it before the investigation identifies additional violations.

Enterprise prevention checklist

The most cost-effective ULP strategy is prevention. Talent assessment practices intersect directly with ULP risk — discriminatory hiring proxies or inconsistent promotion data can surface as 8(a)(3) evidence in a contested case. Testlify’s structured assessment tools produce auditable, objective score records that demonstrate non-discriminatory selection decisions.

• Manager TIPS training. Train all people managers on four prohibited election campaign behaviors: Threats, Interrogation, Promises, Surveillance. Deliver annually; document completion.
• Communications audit. Before any organizing campaign response, have labor counsel review all planned communications for 8(a)(1) exposure.
• Unilateral change protocol. Build a mandatory review gate into any policy or compensation change process that flags whether a recognized bargaining unit requires notice and bargaining before implementation.
• Adverse action documentation. Every termination, demotion, or disciplinary action affecting a known union supporter must have contemporaneous, written, non-pretextual justification. Timestamp matters.
• Grievance channel hygiene. Maintain functional, responsive grievance processes. Employees who perceive no internal remedy are more likely to file external charges.
• Hiring process audit trail. Use skills-based assessments for structured candidate evaluation. Score records tied to objective criteria are the strongest defense against discriminatory-hiring allegations under 8(a)(3).
• Annual labor relations audit. Review NLRB charge history for your industry, identify emerging enforcement priorities, and adjust training accordingly.

For HR teams building compliant, defensible hiring processes at scale, workforce planning frameworks that embed documentation standards from day one reduce ULP exposure before it materializes.

Frequently asked questions