AP
FILE-In this March 28, 1968 file photo, a policeman, right, holds his revolver at ready as he and another officer retreat with a looter in custody, during racial unrest in Memphis, Tenn. Fifty years ago, two sanitation workers were killed by a malfunctioning garbage truck in Memphis. Martin Luther King Jr. came to Memphis to support the strike, a move that cost him his life when he was fatally shot on the balcony of a Memphis hotel on April 4, 1968. (AP Photo/Jack Thornell, File)