The short answer is no — it is illegal in every country covered here. But employers do it anyway and disguise it as something else. Here is how to prove it and what to do immediately.
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No. Firing an employee for joining a union, organizing a union, participating in union activities, or supporting a union drive is an unfair labour practice — illegal in the US, Canada, UK, France, and Mexico. It does not matter if you are in a probationary period, an at-will employee, or if the employer gives a different stated reason for the firing. The real reason is what matters — and labour boards and courts look past the stated reason to find it.
You are protected from retaliation for all of the following — at every stage, including before a union is certified:
Employers almost never say "I'm firing you for union activity." Instead they reach for these pretexts — and labour boards see through them every day.
The closer in time your firing is to known union activity, the stronger the inference of retaliation. Document: when you signed your union card, when your employer found out about your activity, and when the discipline or termination happened. A termination within days or weeks of the employer learning of your union support is extremely compelling evidence.
Were you fired for something that other employees — who are not union supporters — have done without consequence? Selective enforcement of a rule is a classic indicator of pretextual termination. Identify comparable employees, their conduct, and their outcomes. This comparative evidence is central to most retaliation cases.
The employer must have known about your union activity for it to be retaliation. Evidence of employer knowledge: you were seen at a union meeting, a manager received a report about your organizing, you were questioned about your union support, or a coworker told management you were involved. Any of these establishes the link.
Whatever reason the employer gives for the firing — save it. Then find evidence that contradicts it: prior positive performance reviews, the absence of any prior warnings, comparable employees who did the same thing and kept their jobs. The less credible the stated reason, the more powerful the inference that the real reason was union activity.
Yes. Probationary status does not remove your protection from retaliation for union activity. The NLRA (US), Canada Labour Code, and UK TULRCA all apply regardless of probationary status. In fact, firing a probationary employee immediately after union activity is a classic pattern that labour boards recognise and take seriously.
The key is the timeline and comparative treatment. Was your performance record clean before the union activity started? Were other employees with similar performance records kept on? Did discipline suddenly appear right after the employer learned of your organizing? These three questions, documented and answered, form the core of your retaliation case. File an unfair labour practice charge and let the labour board investigate the employer's records.
Yes — retaliation does not require termination. Demotion, hour reduction, unfavorable scheduling, transfer to undesirable assignments, stripping of seniority rights, or any other adverse action taken because of union activity are all unfair labour practices. The same rules, timelines, and remedies apply.
Labour boards can order your employer to give you your job back with full back pay. But the window to file is short — and every day you wait is another day of back pay potentially lost.
NLRB — from date of firing.
Provincial board — act now.
No qualifying period required.
Prud'hommes / labour inspector.
Tribunal Laboral — strict.
*Always confirm with legal aid immediately.
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