List of people who are known for their cruel and violence behavior.

Murderabilia is a new term given to collectibles by or about murders, or murderers. It can fetch truly astronomical prices on auction sites such as eBay, though the sale of such items is usually prohibited.

Most of us could never imagine taking the life of another human being. But what about those who kill repeatedly? What makes them tick? Are they really crazy, or just thirsty for blood? Below are 10 of the most notorious killers of our time.