The Rev. Ralph David Abernathy, left, and Rev. Martin Luther King, Jr. walk away from the Montgomery County Courthouse in Montgomery, Ala., in this Feb. 24, 1956, photo. Within a month of the assiassination of Dr. King, the FBI launched an investigation of King's successor, looking for the same type of "immoral activities" with Rev. Abernathy the bureau had tried to use to discredit Dr. King, newly released FBI files show. (AP Photo/File)