Alan Turing, who is said to be the father of modern computer science, was a WWII code-breaker until he was prosecuted by the British government for having homosexual relations. Thousands have now signed a petition calling for a government apology.
Turing committed suicide two years after his prosecution in 1954, but was before given experimental chemical castration as a "treatment". He is most well known for his Nazi enigma code breaking work for the British during the second World War and his helping establish a test to measure the intelligence of a machine which is now known as a Turing Test.
So far more than 5500 signatures have been collected on the Downing Street petition started by computer scientist John Graham-Cumming. Author Ian McEwan put his John Hancock on the petition. I'd sign up but it looks like you need a UK address. [BBC]