Jeffrey Sack Law
1 lawyer · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 478 handling Employment & Labour Law.
1 lawyer · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 478 handling Employment & Labour Law.
Jeffrey Sack Law is a solo Toronto practice built around labour law, run by Jeffrey Sack, K.C. from an office on Yonge Street in midtown Toronto. Sack's practice centres on unions and professional associations rather than individual employees, and it spans litigation, collective bargaining, and interest arbitration. Sack was a co-founder of Sack Goldblatt Mitchell, a Toronto labour firm started in the mid-1970s that grew into a major union-side practice before becoming Goldblatt Partners LLP.
As a litigator, Sack argued the Lavigne case at the Supreme Court of Canada, which upheld the constitutional validity of the Rand formula and confirmed unions' right to direct dues toward political activities. Sack also argued the first case to uphold the right to strike under the Canadian Charter of Rights and Freedoms. On the negotiating side, Sack has bargained with government on behalf of physicians and with hospitals on behalf of medical residents, and has sat as a union nominee on interest arbitration boards for firefighters, police officers, faculty, and health care support staff.
The office sits on Yonge Street in Davisville Village, a midtown Toronto neighbourhood that runs between St. Clair and Eglinton avenues. It's a corridor of office buildings mixed with apartment and condo towers, anchored by the Davisville subway station on Line 1, which makes the office an easy transit trip for clients and union representatives coming from across the city.
1881 Yonge Street, Suite 500, Toronto, Ontario M4S 3C4 · 416-271-4003
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Criminal DefenceListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗