claim: Sledgehammer was first performed live in 2004.
evidence: Grace Hartman -LRB- nee Fulcher , July 14 , 1918 -- December 18 , 1993 -RRB- was a Canadian labour union activist , whose 1975 election to the presidency of the Canadian Union of Public Employees made her the first woman in North America to lead a major labour union .. Canadian Union of Public Employees. Canadian Union of Public Employees. Canadian. Canadians. labour union. trade union. North America. North America