Can Maclean's and Ezra Levant use the Alberta Press Act Reference as a precendent to show provincial regulation of the press via Human Rights legislation is ultra vires?
I'm researching Oliver Mowat Biggar, who represented the SoCred side (and lost). The Aberhart government essentially wanted to establish a press censorship system. The Supreme Court of Canada ruled that regulation of the accuracy of the press was a federal responsibility.
The Wikipedia entry is sparse. The real meat is in the Supreme Court decision that's linked.
Pile this on top of the Charter arguments and I suspect the provincial Human Rights complaints would be tossed.