In February 1946, the Canadian government disclosed to the public the defection of a Soviet cipher clerk,
Igor Gouzenko, in Ottawa; who also disclosed the existence of a Soviet spy ring in the country. The event has been used by historians to mark the beginning of the Cold War era in Canada, with the
Gouzenko Affair triggering another
red scare in Canada. Despite its comparatively moderate stance towards Communism, the Canadian state continued intensive surveillance of Communists and sharing of intelligence with the United States.
PROFUNC was a
Government of Canada top secret plan to identify and detain
Communist sympathizers during the height of the
Cold War. Tensions between Canada and the United States heightened during this time as on April 4, 1957,
Canadian Ambassador to Egypt,
E. Herbert Norman, leaped to his death from a
Cairo building after the
United States Senate Subcommittee on Internal Security released a textual record of a previous hearing to the media. Despite having been cleared several years earlier—first by the
RCMP in 1950, then again by the
Canadian Minister of External Affairs,
Lester B. Pearson (later Prime Minister)—the American media portrayed Norman as a spy and traitor. The only evidence the United States had was that as a student at Cambridge and Harvard he was a part of a Marxist communist study group. This made Pearson, who was still External Affairs Minister, backed by outrage across the country, send a
note to the U.S. Government, threatening to offer no more security information on Canadian citizens until it was guaranteed that this information would not slip beyond the executive branch of the government.
Peacekeeping in Korea during the
Korean War. It was during the Cold War period that Canada began to assert the international clout that went along with the reputation it had built on the international stage in World War I and World War II. In the
Korean War, the moderately sized contingent of volunteer soldiers from Canada made noteworthy contributions to the
United Nations forces and served with distinction. Of particular note is the
Princess Patricia's Canadian Light Infantry's contribution to the
Battle of Kapyong. Canada's major Cold War contribution to international politics was made in the innovation and implementation of '
Peacekeeping'. Although a United Nations military force had been proposed and advocated for the preservation of peace vis a vis the U.N.'s mandate by Canada's representatives
Prime Minister Mackenzie King and his Secretary of State for External Affairs
Louis St. Laurent at the United Nations Conference on International Organization in San Francisco in June 1945, it was not adopted at that time. During the
Suez Crisis of 1956, the idea promoted by Canada in 1945 of a United Nations military force returned to the fore. The conflict involving
Britain,
France,
Israel and
Egypt quickly developed into a potential flashpoint between the emerging '
superpowers' of the
United States and the
Soviet Union as the Soviets made intimations that they would militarily support Egypt's cause. The Soviets went as far as to say they would be willing to use "all types of modern weapons of destruction" on London and Paris—an overt threat of nuclear attack. Canadian diplomat
Lester B. Pearson re-introduced then-Prime Minister
Louis St. Laurent's UN military force concept in the form of an 'Emergency Force' that would intercede and divide the combatants, and form a buffer zone or '
human shield' between the opposing forces. Pearson's
United Nations Emergency Force (UNEF), the first peacekeeping force, was deployed to separate the combatants, and enforce a
ceasefire and resolution that was drawn up to end the hostilities. ==Canada–U.S. tensions (1961–1980)==