Congressional staff members gather at the Capitol to raise awareness of the recent killings of black men by police officers, both of which did not result in grand jury indictments, on Dec. 11. They are joined by Rep. Elijah Cummings, D-Md. (second from left), and Senate Chaplain Barry Black (far right). J. Scott Applewhite/AP hide caption

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Ossie Davis and Ruby Dee at the 1989 Cannes Festival for the showing of Spike Lee's Do The Right Thing. Courtesy of David Lee/All Rights Reserved hide caption

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One man was convicted in the bombing in 1977, but more than two decades would pass before any other suspects were tried for murder. AP hide caption

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The Congressional Gold Medal has been posthumously awarded to four girls killed in the 1963 bombing of Birmingham's 16th Street Baptist Church. President Obama signed the legislation Friday, as (from left) Birmingham Mayor William Bell, Dr. Sharon Malone Holder, Attorney General Eric Holder, Rep. Terri Sewell, and relatives of Denise McNair and Carole Robertson look on. Pool/Getty Images hide caption

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In February 1960, college students (from left) Joseph McNeil, Franklin McCain, Billy Smith and Clarence Henderson began a sit in protest at the whites-only lunch counter at a Woolworth's in Greensboro, N.C. Jack Moebes/CORBIS hide caption

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Civil rights leaders Rev. Martin Luther King Jr., left, Rev. Fred Shuttlesworth, center, and Rev. Ralph Abernathy hold a news conference in Birmingham, Ala., in this May 8, 1963 file photo. Shuttlesworth, who was hailed by the Rev. Martin Luther King Jr. for his courage and energy, died Wednesday, Oct. 5.

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In 2004, the federal courthouse where U.S. District Judge Matthew Perry worked was named after him. Here, Perry speaks at the dedication ceremony. Lou Krasky/AP hide caption

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Kwame Nkrumah Masoleum is the final resting place of Ghana's first president, who led the campaign to liberate Ghana from colonial rule on March 6, 1957. neate photos/flickr hide caption

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