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Henry Slatter (15 October 1830 – 5 July 1902) was a British trade union leader. Born in Cheltenham, Slatter moved with his family to Birmingham when he was five years old, and was educated at a Unitarian Mutual Improvement School. He completed an apprenticeship as a printer before relocating to Manchester, where he worked for the Manchester Examiner and Times. In 1883, Slatter was appointed as a magistrate, one of the first working-class magistrates in Manchester. He was also a founder of the Co-operative Printing Society.