freedom fighter / terrorist.
treason / fighting for equal rights.
Doesn't really matter.
Don't get me wrong, I have utmost respect for Nelson. Not what he did prior to his jail term but specifically after 1994.
When South Africa won the Rugby World Cup in 1995 and NM wore the rugby jersey of his white oppressors, that did more for unity then anything else since and South Africa was in a very bad place in 1995. Truly forgive and forget, not many people can do that.
The country needs another Nelson Mandela very badly, just google "Julius malema" (potentially a future SA president)
For reference from the nobel prize site:
Question: Why was Nelson Mandela sent to jail?
Answer: Nelson Mandela was arrested and jailed because he was accused of treason by the South African government. In 1944 he joined the African National Congress (ANC), which challenged the South African ruling party's apartheid policies. He went on trial for treason in 1956-1961 and was acquitted in 1961. Mandela formed the military wing of the ANC, the Umkhonto we Sizwe (MK), which went underground after the ANC was banned in 1960. He was arrested in 1962 and sentenced to five years' imprisonment with hard labour. When many leaders of the ANC and the MK were arrested for plotting to overthrow the government by violence, Nelson Mandela was also brought to stand trial with them, and he was one of eight accused that were sentenced to life imprisonment.
http://nobelprize.org/nobel_prizes/peace/laureates/1993/mandela-faq.html
EDIT: Julius Malema is the correct name for potential future president