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A police officer uses his nightstick on a youth reportedly involved in the looting that followed the breakup of a march led by Dr. Martin Luther King Jr. March 28, 1968, in Memphis, Tenn. Black leaders accused the police of brutality while police officers said they did what was necessary to restore order. In the wake of the violence, a curfew was imposed and more than 3,800 National Guardsmen were rushed to the city. A week later, King was assassinated at Memphis' Lorraine Motel. (KEYSTONE/AP Photo/Jack Thornell)