This sound is from Martin Luther King Soundboard

King advanced civil rights for people of color in the United States through nonviolence and civil disobedience. The SCLC put into practice the tactics of nonviolent protest with some success. Martin Luther King Jr. led marches for the right to vote, desegregation, labor rights, and other civil rights.
See also: Martin Luther King Jr. Day, Martin Luther King III, Martin Luther King Jr. Memorial, Assassination of Martin Luther King Jr., Martin Luther King Sr., and Martin Luther King Jr. National Historical Park.