Answer:
Nelson Mandela was among the first to advocate armed resistance to apartheid going underground in 1961 to form the ANC's armed wing. He left South Africa and traveled the continent and Europe, studying guerrilla warfare and building support for the ANC. Branded a terrorist by his enemies, Mandela was sentenced to life imprisonment in 1964, isolated from millions of his countrymen as they suffered oppression, violence and forced resettlement under the apartheid regime of racial segregation. He was imprisoned on Robben Island, a penal colony off Cape Town, where he spent the next 18 years before being moved to mainland prisons.