Explanation:
Sir Edwin Chadwick (24 January 1800 - 6 July 1890) was an English social reformer who is noted for his work to reform the Poor Laws and to improve sanitation and public health.
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He was arrested and imprisoned in 1962, and subsequently sentenced to life imprisonment for conspiring to overthrow the state following the Rivonia Trial. Mandela served 27 years in prison, split between Robben Island, Pollsmoor Prison and Victor Verster Prison.