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Ralph Abernathy, foreground left, and Martin Luther King Jr., foreground right, lead a column of demonstrators as they attempt to march on Birmingham, Ala., City Hall, April 12, 1963. Arrested for leading a march against racial segregation in 1963, King spent days in solitary confinement writing his "Letter From Birmingham Jail," which was smuggled out and stirred the world by explaining why Black people couldn't keep waiting for fair treatment. (AP Photo/Horace Cort, File)