Campbell was a key player in most of the important events of the civil rights movement:

He was one of the four people who escorted the black students who integrated the Little Rock, Ark., public schools in 1957.

He was the only white minister among about 60 pastors invited to attend the meeting in Atlanta that same year where King laid the foundations for the SCLC.

He joined the Freedom Riders who worked to integrate buses in Alabama in 1961.

He was with King for the march on Birmingham in 1963.

He was King for the march on Selma, Ala., in 1965.