The Canadian Party of Labour was a Marxist-Leninist political party in Canada. The CPL was not an electoral party, as such, but a revolutionary party attempting to assemble a mass movement of workers and affiliated organizations who could lead a Communist revolution. It was a fraternal party of the Progressive Labor Party in the United States until about 1979 when the two organizations disagreed over the question of self-determination for Québec. The group was in existence from the late 1960s to the early 1990s and was most active in British Columbia Québec and Ontario where a number of its members achieved office in the United Steel Workers of America and the Canadian Union of Postal Workers.