AG Canada v AG Ontario (Labour Conventions Case)
[1937] Appeal Cases 32619371 min read
The case in brief30-second read
- Facts
- Canada ratified ILO Conventions on hours of work, weekly rest, and minimum wages. Federal Parliament enacted implementing legislation. Ontario argued labour regulation fell within provincial legislative competence under the BNA Act.
- Issue
- Whether the federal government can legislate on provincial subjects to implement international treaties.
- Held
- Treaty-making is an executive (federal) power.
- Principle
- The power to implement treaties in domestic law follows the division of legislative powers in the constitution. In a federal state, the central government cannot legislate on matters within provincial/state competence merely because it has entered a treaty on that subject.
Facts
- Canada ratified ILO Conventions on hours of work, weekly rest, and minimum wages
- Federal Parliament enacted implementing legislation
- Ontario argued labour regulation fell within provincial legislative competence under the BNA Act
Issue
- Whether the federal government can legislate on provincial subjects to implement international treaties.
Held
- Treaty-making is an executive (federal) power
- But legislative implementation must follow the constitutional distribution of powers
- Labour is a provincial subject; federal Parliament cannot legislate on it merely because a treaty exists
- Federal legislation struck down
Ratio decidendi
In a federal state, the distribution of legislative powers between the centre and the units cannot be altered by the executive's treaty-making power. Implementation of treaties on matters within state/provincial competence requires state/provincial legislation.
Exam use
How to use it in an answer
- Authority for dualist approach in federal states
- Shows treaty-making ≠ treaty-implementation power
- Relevant for PIL Unit 1 (IL and municipal law relationship)
- Key line: "In AG Canada v. AG Ontario (1937), the Privy Council held that the federal government cannot legislate on provincial subjects merely because it has entered a treaty on that subject."
Cite this
Citation
AG Canada v. AG Ontario (Labour Conventions Case) [1937] Appeal Cases 326Reported: [1937] AC 326. This is an educational summary, not the judgment itself. Cite the reported version in professional or academic work.