Martin Luther King waves to supporters during the 1963 March on Washington./Credit: AFP/Getty Images
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Jacob Blake's sister at March on Washington: 'Black America, I hold you accountable'
Fifty-seven years to the day Martin Luther King Jr. gave his "I Have a Dream" speech, relatives of African Americans killed or injured in recent police encounters took to the same spot on the National Mall to emotionally call for social and political change.
