5. Nelson Mandela [South Africa]
He was sentenced to life in prison in 1962 for conspiring against the state after his militant group Umkhonto we Sizwe, launched a sabotage campaign against the government but was freed in 1990 after serving 27 years.
In 1994 Mandela became the first black President of South Africa after winning a multiracial general election. A true statesman, he only served one term before handing over the reins to Thabo Mbeki.