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FILE-In this March 28, 1968, file photo, Dr. Martin Luther King Jr. and Rev. Ralph Abernathy, right, lead a march on behalf of striking Memphis, Tennessee., sanitation workers. 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. (Sam Melhorn/The Commercial Appeal via AP)

FILE-In this March 28, 1968, file photo, Dr. Martin Luther King Jr. and Rev. Ralph Abernathy, right, lead a march on behalf of striking Memphis, Tennessee., sanitation workers. 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. (Sam Melhorn/The Commercial Appeal via AP)