Bishop Julian Smith (left) and Rev. Ralph Abernathy (right) flank Dr. Martin Luther King Jr., during a civil rights march in Memphis on March 28, 1968 AP
Civil rights leader Dr. Martin Luther King Jr. waves to supporters on August 28, 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 April 4, 1968 in Memphis, Tennessee AFP
The Rev. Martin Luther King Jr. is welcomed with a kiss by his wife Coretta after leaving court in Montgomery, Alabama on March 22, 1956 AP
Dr. Martin Luther King Jr. shakes hands with Vice President Richard Nixon as they meet to discuss race issues in the South, on June 13, 1957 AP
Revs. Ralph Abernathy and Dr. Martin Luther King Jr., right are taken by a policeman as they led a line of demonstrators into the business section of Birmingham, Alabama, on April 12, 1963 AP
From left: Dr. Martin Luther King Jr., President Lyndon B. Johnson, Whitney Young, and James Farmer attend a meeting on Civil Rights in the Oval Office of the White House on January 18, 1964, in Washington, D.C AP
Dr. Martin Luther King Jr. reacts in St. Augustine, Florida, after learning that the senate passed the civil rights bill on June 19, 1964 AP
Rev. Martin Luther King Jr. stands with other civil rights leaders on the balcony of the Lorraine Motel in Memphis, Tennessee, on April 3, 1968, a day before he was assassinated at approximately the same place. From left are Hosea Williams, Jesse Jackson, King, and Ralph Abernathy AP
An unidentified woman weeps uncontrollably at a Memphis funeral home early Friday morning, April 5, 1968, as hundreds of mourners filed past the body of Dr. Martin Luther King before it was to be sent to Atlanta AP
At the Civil Rights March on Washington, D.C., people march along the mall next to the Reflecting Pool and the Washington Monument on August 28, 1963 (National archive)
On August 28, 1963, Dr. Martin Luther King Jr., addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington AP
Firefighters use their water hose against civil rights demonstrators in Birmingham, Ala. on July 15, 1963 AP
A memorial plaque at the Sixteenth Street Baptist Church in Birmingham, Ala. for Denise McNair, Cynthia Wesley, Addie Mae Collins and Carole Robertson, the four girls killed in a bombing at the church in 1963 AP
Civil rights leader Dr. Martin Luther King Jr. displays pictures of three civil rights workers, Michael Schwerner, James Chaney, and Andrew Goodman who were slain in Mississippi the summer before at a news conference in New York on Dec. 4., 1964 AP