Jehovah's Witnesses experienced religious persecution in Canada during both world wars because of their evangelical fervour, conspicuous abstinence from patriotic exercises and conscientious objection to military service.
During World War I Jehovah's Witnesses were targeted because of their anti-war attitudes and refusal to take part in military service. Rather than being banned directly, Jehovah's Witnesses had to deal with censorship of their literature during the war and the court’s refusal to recognize them as a legitimate denomination, thus rendering unable to claim the status of conscientious objectors.
During the late 1930s, Witnesses were tried for sedition because their literature attacked the clergy and political leaders of the country.
In 1940, one year following Canada's entry into World War II, the Jehovah's Witnesses denomination was banned under the War Measures Act. This ban continued until 1943. During this period, some of their children were expelled from school; other children were placed in foster homes; members were jailed; men who refused to enter the army were sent to work camps. In 1940, twenty-nine Witnesses were convicted and sentenced to terms averaging one year.
In his book State and Salvation, William Kaplan wrote:
In July 1940 the government of Canada banned the Jehovah's Witnesses. Overnight it became illegal to be a member of this sect. The law, passed under the War Measures Act, was vigorously enforced. Beatings, mob action, police persecution, and state prosecution confronted the Jehovah's Witnesses as they ignored the ban and continued to go about their work spreading the word of God... The struggle was bitter indeed. Jehovah's Witness children who refused to sing the national anthem and salute the flag during patriotic exercises in public schools were often expelled from class, and in a few cases, removed from their parents' care and placed in foster homes and juvenile detention centres. Men of military service age who refused to fight spent the war trying to get out of alternative service camps established across Canada for conscientious objectors. Jehovah's Witness spent a good deal of time in the courts during the war years; they challenged government policies with which they disagreed, and were arrested in the hundreds and charged with being members of an illegal group.
From 1936 to 1959, Jehovah's Witnesses faced religious and civil opposition in Quebec. Historically, the Roman Catholic Church had been the dominant institution in the life of the province of Quebec and a major influence on French Canadian culture. It nurtured the young people of Quebec, in language and faith; and at the same time it endorsed the legitimacy of British rule and of the established economic order.