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American Civil Rights leader Dr. Martin Luther King Jr. (1929 - 1968) speaks at a rally held at the Robert Taylor Houses in Chicago, Illinois, 1960s. (Photo by Robert Abbott Sengstacke/Getty Images)

American Civil Rights leader Dr. Martin Luther King Jr. (1929 - 1968) speaks at a rally held at the Robert Taylor Houses in Chicago, Illinois, 1960s. (Photo by Robert Abbott Sengstacke/Getty Images)