The extreme security measures permitted by the regulations included the waiving of habeas corpus and the right to trial, internment, bans on certain political and cultural groups, restrictions of free speech including the banning of certain publications, and the confiscation of property.
"[1] The Regulations were used to intern opponents of World War II, particularly fascists (like Adrien Arcand) and Communists (including Jacob Penner, Bruce Magnuson and Tom McEwen) as well as opponents of conscription such as Quebec nationalist and Montreal mayor Camillien Houde.
The Regulations were also used to ban the Communist Party of Canada in 1940 as well as several of its allied organizations such as the Young Communist League, the Canadian Labour Defence League, the Canadian League for Peace and Democracy, the Ukrainian Labour Farmer Temple Association, the Finnish Organization of Canada, the Russian Workers and Farmers Clubs, the Polish Peoples Association and the Croatian Cultural Association, the Hungarian Workers Clubs and the Canadian Ukrainian Youth Federation.
[3] A number of prominent Communist Party members were detained until 1942, the year after the Soviet Union joined the Allies.
Fascist leaders such as Adrien Arcand and John Ross Taylor were detained for the duration of the war.