Raised in Brooklyn alongside his brother Al, Frank Capone followed mobster Johnny Torrio to Chicago in the 1920s and helped build the city's crime family.

Tex Watson was just a young man from Texas in 1969 when he came under the spell of drugs and Charles Manson — and helped kill seven people.

Zachary Davis had a history of mental disturbance, but no one could have predicted that the Tennessee teen would beat his mother to death one night in August 2012.

A torture device commonly used to elicit prisoner confessions in early modern Europe, the thumbscrew was designed to crush victims’ fingers or toes, leaving them in incredible pain — but alive.

Despite having no legal experience, Roy Bean was appointed a justice of the peace in Pecos County, Texas to help establish law and order there in the 19th century — and he did so in the most Wild West way imaginable.

Aum Shinrikyo was founded in 1980s Japan as a yoga and meditation group, but before long, leader Shoko Asahara pushed the group toward chemical weapons manufacturing and terrorist attacks.

Dubbed "Joel the Ripper," Joel Rifkin terrorized prostitutes in the early 1990s — and became the most prolific serial killer in New York history.

Because he was black, Navy sailor Doris Miller was relegated to shining officers' shoes, making beds, and serving meals in the kitchen. Then his heroics at Pearl Harbor earned him the Navy Cross.

During the Viking's blood eagle torture, victims would have their lungs pulled out of their back to create a pair of "wings" — while they were still alive.

The victim who inspired the AMBER alert system, nine-year-old Amber Hagerman was murdered after being abducted while riding her bike in Arlington, Texas on January 13, 1996.

Erik the Red is perhaps best known as the father of Viking explorer Leif Erikson, but he also established the first known European settlement in North America — and it was all because of his violent temper.

West Virginia teens Shelia Eddy and Rachel Shoaf stabbed their best friend Skylar Neese to death on July 6, 2012 — simply because they didn't want to be friends with her anymore.