Since Magnum was founded in 1947, its members have been on hand to bear witness on the front line of world history. From Robert Capa's stark photograph of a Loyalist soldier being shot in the head during the Spanish Civil War to Eve Arnold's astonishingly intimate portraits of well-known faces - from Joan Crawford to Malcolm X - Magnum has changed how we perceive our political leaders, social crises, and the communities next door. Magnum's photographers...