Portrait of Martin Luther King Jr., 1964.

Source: Library of Congress. New York World-Telegram & Sun Collection Photo: Dick DeMarsico

Martin Luther King, Jr. during a civil rights meeting at the White House, Washington DC, on 18 January 1964.

Source: Lyndon Baines Johnson Library and Museum. Photo: Yoichi R. Okamoto

President Lyndon B. Johnson signs the 1964 Civil Rights Act as Martin Luther King, Jr. and others look on. East Room, White House, Washington DC, on 7 February 1964.

Source: Lyndon Baines Johnson Library and Museum. Photo: Yoichi R. Okamoto

Martin Luther King, Jr. giving a lecture, 26 March 1964.

Source: Library of Congress. U.S. News & World Report Photographer unknown No known copyright restrictions.

Telegram informing Martin Luther King Jr. that he had been awarded the 1964 Nobel Peace Prize.

From the archives of the Norwegian Nobel Committee.

Letter of thanks from Martin Luther King Jr. to the Nobel Foundation after being informed about being awarded the 1964 Nobel Peace Prize.

From the archives of the Norwegian Nobel Committee.

Martin Luther King, Jr. and Coretta Scott King, 1964.

Source: Library of Congress Prints and Photographs Division. New York World-Telegram and the Sun Newspaper Photograph Collection, via Wikimedia Commons Photo: Herman Hiller/New York World-Telegram & Sun

From left: King Gustav VI Adolf of Sweden, Harry Belafonte och Martin Luther King Jr. Photo taken in 1966.

Photo: Scanpix [Public domain], via Wikimedia Commons

President Lyndon B. Johnson (left) and Martin Luther King, Jr. in a meeting at the White House, Washington DC, on 18 March 1966.

Source: Lyndon Baines Johnson Library and Museum. Photo: Yoichi R. Okamoto

President Lyndon B. Johnson (left) and Martin Luther King, Jr. in a meeting at the White House, 18 March 1966.

Source: Lyndon Baines Johnson Library and Museum. Photo: Yoichi R. Okamoto