Intimidation, in law, the illegal use of threats or violence to force a person to do or not to do a certain act. It includes false imprisonment, threats of injury to the person or members of his or her family, or actual violence. Generally, contracts made under intimidation have no legal standing.
What makes a person not only murder, but murder multiple people over days, weeks and even years? There's a special name for these types of murderers: serial killers.
Few incidents shaped the U.S. civil rights movement more than the brutal death of Emmett Till. What other murders have sent shock waves through the public psyche?