African-American civil rights activist Martin Luther King, Jr (1929 - 1968, centre) in the front line of the third march from Selma to Montgomery, Alabama, to campaign for proper registration of black voters, 23rd March 1965. From third left: Ralph Abernathy (1926 - 1990), King, Ralph Bunche (1903 - 1971) and Rabbi Abraham Joshua Heschel (1907 - 1972). The first march ended in violence when marchers were attacked by police. The second was aborted after a legal injunction was issued. (Photo by Popperfoto via Getty Images/Getty Images)
