Henry Mayers Hyndman (; 7 March 1842 – 20 November 1921) was an English writer and politician.
Originally a conservative, he was converted to socialism by Marx’s Communist Manifesto, and launched Britain’s first left-wing political party, the Democratic Federation, later known as the Social Democratic Federation, in 1881.
Although this body attracted radicals such as William Morris and George Lansbury, Hyndman was generally disliked as an authoritarian who could not unite his party.
He was the first author to popularise Marx’s works in English.
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