Mass Murderers
Mass murder is the unlawful killing of multiple people, typically defined as three or four or more victims, occurring during a single incident with no cooling-off period.
Home Grown Terrorist
Under U.S. federal law (18 U.S.C. § 2331(5)), the official definition of domestic terrorism involves acts dangerous to human life that violate federal or state criminal laws, occur primarily within the United States, and appear intended to intimidate or coerce a civilian population, influence government policy through intimidation, or affect government conduct by mass destruction, assassination, or kidnapping.
They Tried and Failed
Interesting cases about people who considered murder and got caught before they could take a life.