Sir Leslie Cannon CBE (21 February 1920 – 9 December 1970) was a prominent British trade union official and served as General President of the Electrical Trades Union from 1963 to 1970.
He was born in Wigan, the son of a coal miner, and became a Communist activist, and trade union leader; member of Electrical Trades Union Executive Council, North Lancashire and Merseyside, 1948–1954.
In 1961 he uncovered an ETU ballot rigging scandal, and successfully sued the union.
In his time as leader of the ETU, he took part in a merger with the plumbers' union to create the EETPU.
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