In March 1961 an All-In Africa Conference was held in Pietermaritzburg. Various political groups came together. The banning order on Mandela expired on the eve of the conference, allowing him to make a surprise appearance.
Subsequently he was placed as the Honorary Secretary of the All-In National Action Council. Mandela and the Council decided to arrange demonstrations against the proclamation of South Africa as a Republic on 31 May.
Mandela (nicknamed the Black Pimpernel at the time) was a fugitive for almost a year and a half. After large police roll-out on the strikers, Mandela called the strike off on the second day.
In 1961, Mandela co-founded and became the first leader of Umkhonto we Sizwe (“Spear of the Nation”), also known as MK, a new armed wing of the ANC.