Question: What person heavily influenced a minister and close friend of Martin Luther King Jr.?

Context articles: Bearing the Cross
Clayborne Carson
Martin Luther King Jr. Outpatient Center
King Center for Nonviolent Social Change
Alberta Williams King
Ralph Abernathy
Myles Horton
Martin Luther King Jr. National Historic Site
Jerry Wurf
In the Hour of Chaos

Bearing the Cross: Martin Luther King, Jr., and the Southern Christian Leadership Conference is a 1986 book by David J. Garrow about Martin Luther King Jr., the Southern Christian Leadership Conference, and the American Civil Rights Movement.
 The book won the 1987 Pulitzer Prize for Biography.
Clayborne Carson (born June 15, 1944) is an African-American professor of history at Stanford University, and director of the Martin Luther King, Jr., Research and Education Institute.
 Since 1985 he has directed the Martin Luther King Papers Project, a long-term project to edit and publish the papers of Martin Luther King, Jr.
The Martin Luther King Jr.
 Outpatient Center (MLK OC), formerly known as Martin Luther King Jr.
 Multi-Service Ambulatory Care Center (MLK-MACC), Martin Luther King Jr./Drew Medical Center (King/Drew) and later Martin Luther King Jr.–Harbor Hospital (MLK-Harbor or King–Harbor), is a public urgent care center and outpatient clinic in Willowbrook, an unincorporated section of Los Angeles County, California, north of the city of Compton and south of the Watts neighborhood of Los Angeles.
 Founded as a major public hospital, it was shut down in August 2007 because of its poor record of patient care.
 The urgent care center and outpatient clinic, however, remain operating on the site.
 There are plans to reopen the facility in 2013 as a smaller hospital under a partnership between Los Angeles County and the University of California as a nonprofit organization governed by a seven-member board of directors.
The Martin Luther King Jr.
 Center for Nonviolent Social Change is a nongovernmental, not-for-profit organization founded in 1968 by Coretta Scott King.
 King started the organization in the basement of the couple's home in the year following the 1968 assassination of her husband, Martin Luther King Jr.
Alberta Christine Williams King (September 13, 1904 – June 30, 1974) was Martin Luther King, Jr.'s mother and the wife of Martin Luther King, Sr. She played a significant role in the affairs of the Ebenezer Baptist Church.
 She was shot and killed in the church six years after the assassination of Martin Luther King, Jr.
Ralph David Abernathy Sr. (March 11, 1926 – April 17, 1990) was a leader of the Civil Rights Movement, a minister, and a close friend of Martin Luther King Jr..
 In 1955, he collaborated with King to create the Montgomery Improvement Association, which led to the Montgomery Bus Boycott.
 In 1957, Abernathy co-founded, and was an executive board member of the Southern Christian Leadership Conference (SCLC).
 Following the assassination of King, Abernathy became president of the SCLC.
 As president of the SCLC, he led the Poor People's Campaign in Washington, D.C. during 1968.
 Abernathy also served as an advisory committee member of the Congress on Racial Equality (CORE).
 He later returned to the ministry, and in 1989 — the year before his death — Abernathy wrote, "And the Walls Came Tumbling Down: An Autobiography", a controversial autobiography about his and King's involvement in the Civil Rights Movement.
Myles Falls Horton (July 9, 1905 – January 19, 1990) was an American educator, socialist and cofounder of the Highlander Folk School, famous for its role in the Civil Rights Movement (Movement leader James Bevel called Horton "The Father of the Civil Rights Movement").
 Horton taught and heavily influenced most of the era's leaders.
 They included Martin Luther King Jr, Rosa Parks (who studied with Horton shortly before her decision to keep her seat on the Montgomery, Alabama bus in 1955), John Lewis, James Bevel, Bernard Lafayette, Ralph Abernathy, John B. Thompson, and many others.
The Martin Luther King Jr.
 National Historic Site consists of several buildings including Martin Luther King Jr.'s boyhood home and the original Ebenezer Baptist Church, the church where King was baptized and both his father Martin Luther King Sr. and he were pastors.
 These places, critical to the interpretation of the life of Martin Luther King Jr. and his legacy as a leader of the American Civil Rights Movement, were included in the National Historic Site when it was established on October 10, 1980.
Jerome "Jerry" Wurf (May 18, 1919 – December 10, 1981) was a U.S. labor leader and president of the American Federation of State, County and Municipal Employees (AFSCME) from 1964 to 1981.
 Wurf was a friend of Martin Luther King Jr., and was arrested multiple times for his activism, notably during the Memphis Sanitation Strike and was released just in time to hear Martin Luther King Jr's 'I've Been to the Mountaintop' oratory at the strike, assassination the next day, and attend his funeral.
In the Hour of Chaos is a 2016 American documentary film directed by Bayer Mack.
 It details the life and various trials of the Reverend Martin Luther King Sr. ("Daddy King"), including his violent, poverty-stricken upbringing in rural Georgia, the assassination of his oldest son (civil rights leader Martin Luther King Jr.), the drowning of his younger son Alfred Daniel Williams King and the shooting death of his wife, Alberta Williams King.