Just a year before his assassination, at a Southern Christian Leadership Conference staff retreat in May 1967, Rev. Dr. Martin Luther King, Jr. said:

I think it is necessary for us to realize that we have moved from the era of civil rights to the era of human rights…[W]hen we see that there must be a radical redistribution of economic and political power, then we see that for the last twelve years we have been in a reform movement…That after Selma and the Voting Rights Bill, we moved into a new era, which must be an era of revolution…In short, we have moved into an era where we are called upon to raise certain basic questions about the whole society.