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MONTGOMERY, AL - MAY 1956: Civil rights leader Reverend Martin Luther King, Jr. relaxes at home with his wife Coretta and first child Yolanda in May 1956 in Montgomery, Alabama. (Photo by Michael Ochs Archives/Getty Images)

MONTGOMERY, AL - MAY 1956: Civil rights leader Reverend Martin Luther King, Jr. relaxes at home with his wife Coretta and first child Yolanda in May 1956 in Montgomery, Alabama. (Photo by Michael Ochs Archives/Getty Images)

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American Civil Rights leader Dr. Martin Luther King Jr. (1929 - 1968) speaks at Quinn Chapel on the South Side of Chicago, Illinois, 1960s. (Photo by Robert Abbott Sengstacke/Getty Images)

American Civil Rights leader Dr. Martin Luther King Jr. (1929 - 1968) speaks at Quinn Chapel on the South Side of Chicago, Illinois, 1960s. (Photo by Robert Abbott Sengstacke/Getty Images)

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circa 1964: American civil rights leader Martin Luther King Jr. (1929 - 1968). (Photo by American Stock/Getty Images)

circa 1964:  American civil rights leader Martin Luther King Jr. (1929  - 1968).  (Photo by American Stock/Getty Images)

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Black American civil rights leader Martin Luther King (1929 - 1968) addresses crowds during the March On Washington at the Lincoln Memorial, Washington DC, where he gave his 'I Have A Dream' speech. (Photo by Central Press/Getty Images)

Black American civil rights leader Martin Luther King (1929 - 1968) addresses crowds during the March On Washington at the Lincoln Memorial, Washington DC, where he gave his 'I Have A Dream' speech.   (Photo by Central Press/Getty Images)

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President Lyndon B Johnson (1908 - 1973) discusses the Voting Rights Act with civil rights campaigner Martin Luther King Jr. (1929 - 1968). The act, part of President Johnson's 'Great Society' program trebled the number of black voters in the south, who had previously been hindered by racially inspired laws, 1965. (Photo by Hulton Archive/Getty Images)

President Lyndon B Johnson (1908 - 1973) discusses the Voting Rights Act with civil rights campaigner Martin Luther King Jr. (1929 - 1968). The act, part of President Johnson's 'Great Society' program trebled the number of black voters in the south, who had previously been hindered by racially inspired laws, 1965. (Photo by  Hulton Archive/Getty Images)