Leaders of the South Africa United Front at the head of a march through central London in March 1961 to demand that South Africa leave the Commonwealth. South Africa was forced to withdraw during the Commonwealth Conference held at Marlborough House. L to r: ANC Deputy President Oliver Tambo, Fanuel Kozonguizi of the South West Africa National Union, Yusuf Dadoo of the South African Indian Congress, Labour MP Fenner Brockway and Nana Mahomo of the Pan-Africanist Congress.