Ralph David Abernathy Sr. was an American civil rights activist and Baptist minister. He was ordained in the Baptist tradition in 1948. As a leader of the civil rights movement, he was a close friend and mentor of Martin Luther King Jr. He collaborated with King and E. D. Nixon to create the Montgomery Improvement Association, which led to the Montgomery bus boycott, and co-founded and was an executive board member of the Southern Christian Leadership Conference. He became president of the SCLC following the assassination of King in 1968, where he led the Poor People's Campaign in Washington, D.C., among other marches and demonstrations for disenfranchised Americans. He also served as an advisory committee member of the Congress on Racial Equality.
In 1971, Abernathy addressed the United Nations about world peace. He also assisted in brokering a deal between the FBI and Indian protestors during the Wounded Knee incident of 1973. He retired from his position as president of the SCLC in 1977 and became president emeritus. Later that year he unsuccessfully ran for the U.S. House of Representatives for the 5th district of Georgia.