One Big Union (Canada)

One Big Union

National Industrial Union of the Dominion of Canada
Federation merger	Canadian Labour Congress
Founded	March 13, 1919
Dissolved	1956
Headquarters	Winnipeg
Location	Canada
Members	70,000 (1919)
Key people	Robert B. Russell Victor Midgley Bill Pritchard
Affiliations	Socialist Party of Canada

The One Big Union (OBU) was a militant left-wing industrial union based primarily in Western Canada.^[1] Launched formally in Calgary on June 4, 1919, the OBU, after a spectacular initial upsurge, lost most of its members within a few years. It eventually merged with the Canadian Labour Congress in 1956.