Genocide is one of the deadliest forms of collective criminal behavior. During the 20th century, this form of violence killed more individuals than all the wars, revolutions, and civil wars combined for the same time period. R. J. Rummell (1996) estimates that over 169 million human beings were killed in genocides and genocidal-like events during the last century. It is also important to point out that the frequency and severity of this crime has increased threefold in the last half of the 20th century. Clearly, genocide is a tremendously destructive type of violence, but what exactly is this lethal form of behavior?