National Union of Mineworkerstrade union for coal miners in the United Kingdom. It was formed in 1945 as a reorganisation of the Miners' Federation of Great Britain. From 1981 to 2000 it was led by Arthur Scargill.
In 1984, the NUM went on strike, partly in attempt to damage Margaret Thatcher politically. The Miners' Strike lasted a full year before workers were forced back to work without a deal and was an era-defining moment British politics. The British coal-mining industry never fully recovered from the damage caused by the strike.
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