Rosvall and Voutilainen 1930s 1931 – Estevan riot 1932 – Creation of the Co-operative Commonwealth Federation 1935 – On-to-Ottawa Trek 1935 – Battle of Ballantyne Pier 1938 – Bloody Sunday 1939 – Canada declares war on Germany 1940s 1940 – The Canadian Congress of Labour is founded following the expulsion of supporters of the Congress of Industrial Organizations from the Trades and Labour Congress of Canada in 1939 as a result of pressure from the American Federation of Labor. August 1940 – The first compulsory national unemployment insurance system in Canada is introduced; it comes into operation in July 1941. 1945 – Ford strike of 1945 1946 – Introduction of the Rand formula 1949 – Aggregate union membership in Canada surpasses one million. 1949 – Asbestos Strike 1949 – Controversial American labour unionist Hal C. Banks comes to Canada to assist in a labour dispute between rival shipping unions. 1950s 1952 – First Peace Arch concert by musician and labour activist Paul Robeson 1956 – The Canadian Labour Congress is formed through the merger of the Trades and Labour Congress of Canada and the Canadian Congress of Labour. 1956 – The Mine, Mill and Smelter Workers hold a national convention in Sudbury, Ontario, at which singer and activist Paul Robeson gives his first concert outside the United States since being placed under a travel ban by the United States government in 1950. 1960s 1961 – The New Democratic Party is founded as the successor to the Co-operative Commonwealth Federation and establishes a formal relationship with the organized labour movement. September 10, 1961 - A Mine, Mill and Smelter Workers meeting at the Sudbury Arena, regarding the union's controversial proposal to merge with the United Steelworkers, erupts into a riot. 1963 - Reesor Siding Strike 1963 – The Canadian Union of Public Employees is formed through from the merger of the National Union of Public Employees and the National Union of Public Service Employees. 1965 – Wildcat postal strike, leading to the extension of collective bargaining rights to the majority of the public service 1967 - The international Mine, Mill and Smelter Workers merge with the United Steelworkers. Local 598 in Sudbury, Ontario is the only Mine Mill local in the world to reject the merger, instead continuing operations as an unaffiliated union organization until 1993. 1968 - Air Canada agents in British Columbia begin work-to-rule over a dispute over the