Union Membership — Ontario Employment Law
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About Union Membership
In Ontario, union membership entails a distinct legal relationship between a worker and a trade union, governed primarily by the union's constitution and bylaws. It is a common misconception that simply being part of a unionized workplace automatically makes you a union member. Under Ontario's labour framework, including the Labour Relations Act, 1995 (LRA), individuals frequently belong to a "bargaining unit" and pay mandatory union dues (under the Rand Formula) while choosing whether or not to formally register, swear an oath, or sign an official membership card. However, in certain industries like construction, closed-shop agreements may require formal membership as a condition of employment.
When a worker officially joins a union, the specific rules of that membership operate as a binding contract. This internal constitution dictates who can run for leadership, how voting occurs, and the circumstances under which a member might face expulsion or loss of benefits. For instance, unions commonly uphold "dual unionism" policies, preventing members from simultaneously supporting or organizing for a rival union. The courts generally view these policies as serving a legitimate labour relations purpose. Furthermore, union structures and membership requirements must comply with the Ontario Human Rights Code; mandatory membership that segregates or excludes individuals based on gender, race, or other protected grounds is legally prohibited.
Disputes over membership status, such as unjust expulsions or the denial of union pension and trust benefits, are complex. Courts typically require individuals to exhaust the union's internal appeal procedures before launching a lawsuit, though exceptions exist if there is a fundamental breach of natural justice or a severe Human Rights Code violation. Because the interplay between union constitutions, trust law, and provincial labour legislation is highly specific to the facts at hand, anyone facing the sudden loss of their membership status or related benefits should actively seek independent professional legal advice.
Frequently Asked Questions
Do I have to become a union member if my workplace unionizes?
In most Ontario workplaces, you do not have to formally sign a union membership card or swear an oath. However, under the Rand Formula, you are still required to pay union dues and the union is still legally obligated to represent you in collective agreement matters.
What is the difference between being in a bargaining unit and being a union member?
Being in a bargaining unit means your job is covered by a collective agreement and the union negotiates your wages and working conditions. Being a formal union member grants you internal rights, such as voting on the union's leadership, attending internal meetings, and running for a union office.
Can a union legally expel me or cancel my membership?
Yes. A union can revoke your membership if you violate its constitution, such as actively organizing for a rival union (dual unionism). However, the union must treat you fairly, follow its own procedural rules, and cannot expel you for discriminatory reasons prohibited by the Ontario Human Rights Code.
Will I lose my job if the union expels me from membership?
Usually, no. Under the Labour Relations Act, even in a "closed shop" workplace where membership is required, an employer generally cannot fire you at the union's request if you were expelled for certain protected reasons, such as refusing to participate in an illegal strike or engaging in dissent against the union.
How long do I have to challenge an unfair expulsion from my union?
If you are pursuing a dispute in court over a breach of contract or lost trust benefits resulting from an expulsion, strict limitation periods apply. Under Ontario's Limitations Act, 2002, you generally have two years from the time you discovered the claim to initiate legal action.
When should I consult an independent lawyer about a union membership issue?
You should seek your own legal representation if you face internal membership disputes, expulsion, or are denied union trust benefits. The union's internal lawyers represent the organization's interests, so an independent labour lawyer is necessary to advocate solely for your rights.
Common Scenarios
- A tradesperson is expelled from their current union and loses access to specific member-only dollar bank trust accounts because they were discovered actively campaigning for a competing union.
- A newly hired public sector worker refuses to sign the official union membership card for philosophical reasons, but continues to have mandatory union dues deducted from their paycheque while receiving standard collective agreement protections.
- A group of workers initiates a human rights challenge after discovering their union's historical constitution mandates that they must join a specific local branch segregated entirely on the basis of gender.
What You Should Know
- Always request and carefully review a copy of your union's constitution and bylaws, as these documents form a legally binding contract between you and the organization.
- If your membership is revoked or suspended, ensure you follow and exhaust the union's internal appeal and grievance procedures before attempting to take the matter to an outside court.
- Remember that cancelling your formal membership status will not stop payroll from deducting your mandatory union dues, unless you meet very narrow religious exemption criteria under the Labour Relations Act.
- If you face financial losses regarding union-provided pension or trust benefits due to an expulsion, track all relevant dates immediately so you do not miss critical limitation deadlines to file a claim.
Featured Cases
J. et al. v. G. et al.
2025 ONSC 2048 (CanLII) · 2025-04-14Union Expulsion: Limitation Periods and Pension Benefits
This is a procedural ruling regarding limitation periods in a dispute involving union expulsion and pension benefits. The court addressed whether the ultimate limitation period under the Limitation Act, 2002, barred claims that plaintiffs argued arose in 2021 but were arguably discoverable in the mid-1990s, including arguments regarding concealment and the void ab initio nature of the expulsion.
G. v. M.
2014 ONSC 4410 (CanLII) · 2014-07-23Union Expulsion: Fiduciary Duties & Trust Benefits
This case addresses whether union trustees breached their fiduciary duties by enacting and enforcing a Dual Union Policy that resulted in the plaintiff's expulsion from the union. The court found no breach of fiduciary duty, upheld the policy as serving a legitimate labour relations purpose, and determined that the expelled member was no longer a beneficiary of the union trust or entitled to the return of contributions held in dollar bank accounts.
B. v. P.
1999 CanLII 15079 (ON SC) · 1999-06-04Union Membership Dispute: Class Action Over Arbitration Award Refusal
A class action involving union members suing other members for breach of contract and tort related to the refusal to implement an arbitration award. The court addressed whether union members can be held personally liable for collective decisions and whether claims in contract can be dismissed on summary judgment. The case later reached the Supreme Court of Canada (B. v. P., 2002 SCC 40). The Supreme Court dismissed the appeal, affirming the lower courts' decisions that a union member cannot be held personally liable to other members for breach of contract based on the terms of the union constitution.
Ontario (Human Rights Commission) v. T.
1997 CanLII 2732 (ON CA) · 1997-11-04Human Rights: Gender-Based Union Membership Appeal
This is an appeal to the Court of Appeal for Ontario regarding whether compulsory membership of women elementary school teachers in a women-only union contravened the Ontario Human Rights Code. The majority held that such gender-based segregation constituted discrimination, while the dissent emphasized the historical context of the union's role.
T. v. A.
1992 CanLII 7522 (ON SC) · 1992-09-14This is an interlocutory appeal concerning the jurisdiction of a motions court judge to grant injunctive relief in a labour dispute involving union membership and disciplinary actions. The appeal addresses whether the relief granted exceeded the claims in the statement of claim and whether procedural requirements for contempt orders were met.
Regina v. Bushnell Communications Ltd. et al.
1974 CanLII 559 (ON CA) · 1974-04-04Union Membership Dismissal: Proximate Cause Test
This is an appeal from a criminal conviction under the Canada Labour Code regarding the dismissal of an employee due to union membership. The Court of Appeal addressed whether union membership must be the sole or principal cause of dismissal to establish an offence, ruling that it must be a proximate cause but may coexist with other causes. The court also reviewed the trial judge's assessment of witness credibility and evidence regarding the employer's motivation.
Regina v. Bushnell Communications Ltd. et al.
1973 CanLII 475 (ON SC) · 1973-10-17Union Membership and Termination: Canada Labour Code Section 110(3) Interpretation
A case involving the termination of an employee allegedly due to union membership, addressing whether union membership must be the principal reason for dismissal to constitute an offence under section 110(3) of the Canada Labour Code. The trial judge dismissed the charge due to insufficient proof of union membership as the principal reason for termination, and the case examines whether the trial judge applied the correct standard of proof.
B. v. J. et al.
1958 CanLII 345 (ON CA) · 1958-03-13Union Member Suspension: Constitutional Authority Appeal
This is an appeal from a trial decision concerning the suspension of a union member. The Court of Appeal found that the union defendants exceeded their constitutional authority in suspending the plaintiff, although it disagreed with the trial judge's finding of bad faith due to insufficient evidence.