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The roots of the Power Workers' Union go back to 1944, with the formation of the Employees' Association at Ontario Hydro. Eleven years later, in 1955, the Association became the Ontario Hydro Employees' Union and joined the National Union of Public Service Employees, which merged with the National Union of Public Employees in 1963 to form the Canadian Union of Public Employees (CUPE), Canada's largest union. The present name - the Power Workers' Union, was adopted in 1993.