He was the voice of the anti-apartheid movement in South Africa. He was jailed by the government for 27 years on charges of sabotage and other crimes committed while he led the movement against apartheid. Upon his release from prison he helped lead the transition towards multi-racial democracy in South Africa. He received the Nobel Peace Prize in 1993 and served as the president of South Africa from 1994-1999. Which world leader is being described by these statements?