The Royal Canadian Mounted Police has a history dating back to 1873 and has been involved in several high-profile controversies during that time, particularly in the 1970s.
Until 1920, the RCMP's forerunner, the Royal Northwest Mounted Police, operated only in Western Canada and the North. The new organization was created by an amalgamation with the Dominion Police, giving the RCMP a national security mandate as a departure from its earlier role as a frontier police force. Early controversies grew from its preoccupation with Communism and the labour movement. Following from its operations in the Winnipeg General Strike of 1919, the RCMP intervened in labour disputes, not as an impartial law enforcement agency, but to assist with breaking strikes. In one incident, RCMP officers clashed with striking coal miners for 45 minutes in Estevan, Saskatchewan in 1933 and killed three miners during the melee (see Estevan Riot). Part of its strategy against labour organizing included extensive use of spies for surveillance of suspected Communists, which was revealed at the court trial that convicted the leadership of the Communist Party under Section 98 of the Criminal Code in 1932. Political surveillance activities were conducted out of its Criminal Investigation Department until a separate branch, the RCMP Security Service, was established in 1950. The RCMP was also the force used to stop the On-to-Ottawa Trek by precipitating another bloody clash that left one Regina city police officer and one protester dead in the 1935 Regina Riot. The Mounties were frequently criticized for these activities by labour and the left, including one of its most prominent surveillance targets, Member of Parliament J. S. Woodsworth. A dispute with the Government of Alberta over prohibition led to the creation of a separate Alberta Provincial Police from 1917 to 1932.