The only I can think of is Currie, and I believe that was a private civil action.
You raise a fair point, but the 'Charter' argument fails; 'mobility rights' as written were not impacted. Even without a Section 1 'reasonable limits' test, Intra and inter provincial travel was still possible. Ontario did announce it but retracted it less than a day later.
6. (1) Every citizen of Canada has the right to enter, remain in and leave Canada.
(2) Every citizen of Canada and every person who has the status of a permanent resident of Canada has the right:
- to move to and take up residence in any province; and
- to pursue the gaining of a livelihood in any province.
(3) The rights specified in section (2) are subject to:
- any laws or practices of general application in force in a province other than those that discriminate among persons primarily on the basis of province of present or previous residence; and
- any laws providing for reasonable residency requirements as a qualification for the receipt of publicly provided social services.
(4) Sections (2) and (3) do not preclude any law, program or activity that has as its object the amelioration in a province of conditions of individuals in that province who are socially or economically disadvantaged if the rate of employment in that province is below the rate of employment in Canada.
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Assuming they would have done something, I wonder how the post-game analysis would have played out if the Conservatives had been in power. Maybe it would have been Hydroxychloroquine or Ivermectin all-round.