The concept of racial harmony hasn't started with Martin Luther King, but he was the one who resolutely came up with a tactful approach of the concept through social history and philosophical application. This is to note that King was a pivotal figure in the Civil Rights Movement, and his works are regarded fairly as influential in social and political structure.
He stated that he dreamt that "little black boys and black girls will be able to join hands with the little white boys and white girls as sisters and brothers."
Direct Action. In one of his letters from Birmingham City Jail, he stated four basic steps to non-violent campaign: 1) Collection of the facts to determine whether injustices exist; 2) Negotiation; 3) Self-purification; and 4) Direct action. He saw these four basic steps of non-violent campaign as a systematic and rational approach to address conventional violent tension protests. In the same context, King explained that direct action is the non violent protest to negotiate with the reluctance of "city fathers," especially on civil rights issues. In King's view, non-violent direct action could create the same crisis and tension like violent protests - enough for a nation and its officials to pay attention to, like demand for the responsible party, marches, sit-ins, and the like.
Biological Basis of Race and Conscience. In one of Martin Luther King's statements titled Trumpet of Conscience, he stated that "many people believe that the urban Negro is too angry and too sophisticated to be nonviolent," implying racial discrimination where black people are believed to be incapable of being diplomatic as to carry out non-violent direct action. ...