An Appeal for Human Rights, published by Atlanta students in 1960, is cited as a key moment in beginning the wave of nonviolent direct actions that swept the American South. In 1967, Martin Luther King Jr. began to argue that the concept of "civil rights" was laden with isolating, individualistic capitalist values. He said: "It is necessary for us to realize that we have moved from the era of civil rights to the era of human rights. When you deal with human rights you are not dealing with something clearly defined in the Constitution. They are rights that are clearly defined by the mandates of a humanitarian concern." For King, who began to organize the multi-racial Poor People's Campaign just weeks before his April 1968 assassination, human rights required economic justice in addition to de jure equality.