Umkhonto we Sizwe (MK) means the "Spear of the Nation".
MK was the armed wing of the ANC.
It launched its first guerrilla attacks against government installations on 16 December 1961. It was subsequently classified as a terrorist organization by the South African government and the United States, and banned.
The ANC is in an alliance with the South African Communist Party (SACP) and the Congress of South African Trade Unions (COSATU). Each Alliance partner is an independent organisation with its own constitution, membership and programmes. The Alliance is founded on a common commitment to the objectives of the National Democratic Revolution, and the need to unite the largest possible cross-section of South Africans behind these objectives.