Martin Luther King

380887 02: President Lyndon B. Johnson meets with Rev. Martin Luther King Jr. and other civil rights leaders at the White House. (Photo by National Archive/Newsmakers)

Coretta Scott King and her husband Martin Luther K

OSLO, NORWAY: Coretta Scott King and her husband Martin Luther King 09 December 1964 in Oslo where the US clergyman and civil rights leader received 10 December the Nobel Peace Prize. Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read AFP/Getty Images)

US civil rights leader Martin Luther King, display

OSLO, NORWAY: US civil rights leader Martin Luther King, displays 10 December 1964 in Oslo, his Nobel Peace Prize medal. (Photo credit should read AFP/Getty Images)

Civil Rights Leaders Speak to the Media

381091 30: Roy Wilkins, Dr. Martin Luther King and other civil rights leaders speak to the media after meeting with President Kennedy August 28,1963 at the White House. (Photo by National Archive/Newsmakers)

Civil Rights

380887 05: Rev. Martin Luther King speaks at a civil rights rally at the Lincoln Memorial August 28, 1963 in Washington. (Photo by National Archives/Newsmakers)

Civil Rights Rally

380887 06: Rev. Martin Luther King and other civil rights leaders gather before a rally at the Lincoln Memorial August 28, 1963 in Washington. (photo by National Archive/Newsmakers)

Martin Luther King

380887 01: Secretary of Labor James P. Mitchell (right) shakes hands with Rev. Martin Luther King as Vice President Richard Nixon looks on August 8, 1957 in Washington. (Photo by National Archive/Newsmakers)

President Kennedy Meets with Civil Rights Leaders

381091 31: President John F. Kennedy meets with civil rights leaders at the White House August 28, 1963. (Photo by National Archive/Newsmakers)

Rev. Martin Luther King

380887 52: Rev. Martin Luther King attends a prayer pilgrimage for freedom May 17, 1957 in Washington. (photo by National Archive/Newsmakers)

Civil Rights Rally

380887 07: Rev. Martin Luther King and other civil rights leaders gather before a rally at the Lincoln Memorial August 28, 1963 in Washington. (photo by National Archive/Newsmakers)

Civil Rights Rally

380887 29: Rev. Martin Luther King and other civil rights leaders march at a civil rights rally August 28, 1963 in Washington. (Photo by National Archive/Newsmakers)

Civil Rights Rally

380887 37: Rev. Martin Luther King and other civil rights leaders march at a civil rights rally August 28, 1963 in Washington. (Photo by National Archive/Newsmakers)

Civil Rights Rally

380887 28: Rev. Martin Luther King and other civil rights leaders meet with President John F. Kennedy August 28, 1963 at the White House. (Photo by National Archive/Newsmakers)

Civil Rights Rally

380887 31: Rev. Martin Luther King and other civil rights leaders pose for a picture at a civil rights rally August 28, 1963 in Washington. (Photo by National Archive/Newsmakers)

Civil Rights Movement

380887 67: A group of civil rights leaders speak with Geraldine Whittington, one of President Lyndon B. Johnson's private secretaries, before meeting with the President at the White House. Left to Right: James Farmer, Roy Wilkins , Whitney M. Young, and Rev. Martin Luther King. (photo by National Archive/Newsmakers)

Civil Rights Movement

380887 59: Rev. Martin Luther King receives the Nobel Prize for Peace in 1964. (photo by National Archive/Newsmakers)

Historic Images From The American 20th Century

379570 26: Rev. Martin Luther King Jr. with President Lyndon B. Johnson in the background March 18, 1966 at the White House. (Photo by National Archive/Newsmakers)

Civil Rights Rally

380887 37: Rev. Martin Luther King and other civil rights leaders march at a civil rights rally August 28, 1963 in Washington. (photo by National Archive/Newsmakers)

(FILES) Coretta Scott King shakes hands

(FILES) Coretta Scott King shakes hands with French Medicine Nobel Prize winner professor Jacques Monod (c) as her husband US clergyman and civil rights leader Martin Luther King (3rd-r) looks on 29 March 1966 in Paris' Sport Palace during the meeting of the "Movement for the Peace". From l-r: French actress Simone Signoret, US actor and singer Harry Belafonte, French actor and singer Yves Montand. Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read -/AFP/Getty Images)

Civil Rights Movement

380887 60: Rev. Martin Luther King at the August 28, 1963 civil rights rally at the Lincoln Memorial. (photo by National Archive/Newsmakers)

Coretta Scott King and her husband Martin Luther K

OSLO, NORWAY: Coretta Scott King and her husband Martin Luther King 09 December 1964 in Oslo where the US clergyman and civil rights leader received 10 December the Nobel Peace Prize. Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read AFP/Getty Images)

(FILES) US clergyman and civil rights le

(FILES) US clergyman and civil rights leader Martin Luther King (3rd R) and other major American leaders of the Black civil rights movement (L from R) John Lewis, Whitney Young, Philip Randolph, Martin Luther King, James Farmer and Roy Wilkins, meet 06 March 1963 in Roosevelt Hotel in New York during a meeting dedicated to the organization of the "March on Washington", held 28 August 1963 to promote civil rights for Afro-Americans. Martin Luther King was assassinated 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read OFF/AFP/Getty Images)

The US clergyman and civil rights leader

The US clergyman and civil rights leader Martin Luther King addresses, 29 March 1966 in Paris' Sport Palace the militants of the "Movement for the Peace". Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read OFF/AFP/Getty Images)

Civil rights demonstrators, led by Dr Ma

Civil rights demonstrators, led by Dr Martin Luther King (not pictured), arrive in front of the Brown Chapel AME Church in Montgomery from Selma on March 26, 1965 in Alabama, on the third leg of the Selma to Montgomery marches. The Selma-to-Montgomery March for voting rights ended three weeks and represented the political and emotional peak of the modern civil rights movement. The first march took place on March 07, 1965 ("Bloody Sunday") when 600 civil rights marchers were attacked by state and local police. (Photo credit should read -/AFP/Getty Images)

This aerial view shows a half-mile-long

This aerial view shows a half-mile-long column of civil rights demonstrators, led by Dr Martin Luther King, on March 21, 1965 in Selma, Alabama, as they cross the Edmund Pettus bridge, scene of recent confrontation between demonstrators and state troopers, on the third leg of the Selma to Montgomery marches. The Selma-to-Montgomery March for voting rights ended three weeks and represented the political and emotional peak of the modern civil rights movement. The first march took place on March 07, 1965 ("Bloody Sunday") when 600 civil rights marchers were attacked by state and local police. (Photo credit should read -/AFP/Getty Images)

US President Lyndon Johnson (l) shakes hands with

WASHINGTON, : US President Lyndon Johnson (l) shakes hands with the US clergyman and civil rights leader Martin Luther KIng (c) 03 July 1964 in Washington DC, after handing him a pen during the ceremonies for the signing of the civil rights bill at the White House. Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read AFP/AFP/Getty Images)

Civil rights demonstrators, led by Dr Ma

Civil rights demonstrators, led by Dr Martin Luther King, pass by federal guards as they make their way from Selma to Montgomery on March 23, 1965 in Alabama, on the third leg of the Selma to Montgomery marches. The Selma-to-Montgomery March for voting rights ended three weeks and represented the political and emotional peak of the modern civil rights movement. The first march took place on March 07, 1965 ("Bloody Sunday") when 600 civil rights marchers were attacked by state and local police. (Photo credit should read -/AFP/Getty Images)

(FILES) US clergyman and civil rights le

(FILES) US clergyman and civil rights leader Martin Luther KIng (C), 27, and his wife, Coretta Scott King, emerge 23 March 1956 from Montgomery Court House, following his trial on charges of conspiring to boycott segregated city buses. King was found guilty and sentenced to a 386 days of hard labor and fined $1,000 USD. King immediately appealed. Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to his shooting and was sentenced to 99 years in prison. King's killing, three years after the assassination of black civil rights leader Malcolm X and a few months before Sen. Robert Kennedy's, sent shock waves through American society. (Photo credit should read -/AFP/Getty Images)

Dr. Benjamin Spock (2nd-L), child-care expert, Mar

NEW YORK, UNITED STATES: Dr. Benjamin Spock (2nd-L), child-care expert, Martin Luther King (C), clergyman and black civil rights campaigner, Father Frederick Reed and Cleveland Robinson, unionist leader, lead 16 March 1967 in New York a huge pacifist rally protesting United States involvement in the Vietnam war. (Photo credit should read AFP/AFP/Getty Images)

The civil rights leader Martin Luther KI

The civil rights leader Martin Luther KIng (C) waves to supporters 28 August 1963 on the Mall in Washington DC (Washington Monument in background) during the "March on Washington". King said the march was "the greatest demonstration of freedom in the history of the United States." Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. AFP PHOTO (Photo credit should read -/AFP/Getty Images)

The clergyman and civil rights leader Martin Luthe

WASHINGTON, : The clergyman and civil rights leader Martin Luther KIng (3rd from left) and other black and white civil right leaders march 28 August 1963 on the Mall in Washington DC during the "March on Washington". King said the march was "the greatest demonstration of freedom in the history of the United States." Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read AFP/AFP/Getty Images)