Dominion Police
The Dominion Police Force was the federal police force of Canada between 1868 and 1920, and was one of the predecessors of the Royal Canadian Mounted Police. It was the first federal police force in Canada, formed the year following the Canadian Confederation to enforce federal laws and perform policing duties for the Federal Government of Canada. On 1 February 1920, the Dominion Police was merged with the North-West Mounted Police to form the Royal Canadian Mounted Police as the new federal police force of Canada.
Royal Canadian Mounted Police
The RCMP Security Service was a specialized political intelligence and counterintelligence branch with national security responsibilities, replaced by the Canadian Security Intelligence Service in 1984, following revelations of illegal covert operations relating to the Quebec separatist movement. CSIS is not part of the RCMP, but is its own entity.