Sonny Barger helped mold the Hells Angels into a bloodstained blueprint for all outlaw biker clubs that followed.

When Bronx Capo John Gotti turned on boss Paul Castellano, the most powerful NY Mafia family changed forever.

Who was Jack the Ripper? Various theories about his -- or her -- identity have circulated for decades.

It's one of the most infamous and unsolved mob murders—notorious mobster Bugsy Siegel is gunned down in his Beverly Hills living room.

Uncover the dramatic rise and fall of Joey Gallo, a notorious mobster whose criminal empire once struck fear across the nation.

The Zodiac Killer is one of the most elusive serial killers of all time.

Explore the life and legacy of Joe Colombo, the notorious Mafia boss known for his rise to power and controversial impact.

$10 million stolen in NYC hotel heist

In one of the biggest cash heists in U.S. history, the robbery of Dunbar Armored netted $18.9 million.

The Baker Street Bank suffered one of the biggest heists of all time.

The Mafioso adhered to this strict code of silence when dealing with the law. Death was the almost certain punishment for violators.

A man boards a plane in 1971, exchanges its passengers for a ransom of cash, and disappears. Discover the mystery of one of America's most fascinating missing persons in this collection of scenes from "D.B. Cooper: Case Closed?"

Al "Scarface" Capone sparks one of the bloodiest massacres in gangland history, in this clip from Season 1, "St. Valentine's Day Massacre."

A lone wolf inmate with dreams of writing crime novels becomes the star of his own breakout from a historic Mississippi prison farm.

Follow the American Mafia from their early development in New York City neighborhoods through Prohibition, to the boom days of the 1950s.

James Earl Ray, one of the most infamous assassins in American History, killed MLK and now plots his escape from a Tennessee prison.

"Puente Grande prison once housed one of Mexico's most infamous drug lords, El Chapo, until he orchestrated an elaborate escape. "

Discover the dramatic rise of John Gotti, the notorious 'Teflon Don' who transformed the Gambino crime family.

A respected doctor got away with murder for years. But when word finally got out about his heinous crimes, it earned him the moniker "Dr. Satan".

On April 3, 1996, a CBS news report announces the arrest of Theodore Kaczynski, the Harvard graduate who was suspected and later proven to be the Unabomber. Kaczynski terrorized the country for nearly two decades with a series of mail bombings that killed three people and wounded 23.

Get all the facts and figures about the island of Alcatraz, commonly known as "The Rock".

Experts discuss the events leading up to the capture of Panamanian leader Manuel Noriega in this clip from "America's War on Drugs."

In the midst of post-war suburban life, one green plant threatens this pristine utopia: marijuana. This film warns of the drug’s danger—how it can transform an all-American boy like “Marty” into a dope fiend.

Find out how, as marijuana became ingrained in youth culture, a political campaign pushed back to designate the drug a danger to public health in this clip from The Marijuana Revolution.

Explore the timeline of the weeks leading up to the Jonestown massacre on November 18, 1978.

Learn more about how a secret government mind control program inadvertently fueled the use of psychoactive drugs in 1960s counterculture circles.

In August 1892, Andrew and Abby Borden were found murdered in their Massachusetts home. Andrew's daughter Lizzie would be tried for their murders and was acquitted of all charges.

Uncover the true and horrific stories of 11 of the deadliest serial killers of all time, in this episode of History Countdown.

Al Capone survived assassination attempts, brutal gang wars and an attack by a fellow inmate at Alcatraz. How did unprotected sex finally take down one of history's most notorious gangsters?

There's more than meets the eye to Al Capone, the Prohibition-era leader of organized crime in Chicago.

Revisit the deadly sprees of some of history's scariest serial killers—including one who was never captured.

Explore how the NYC Mafia in the 1990s used extortion tactics to impose a 'mob tax' on legitimate businesses.

Follow the American Mafia from their early development in New York City neighborhoods through Prohibition, to the boom days of the 1950s.

On Nov 22, 1963, President John F. Kennedy was assassinated, shaking the nation to its core.

Morgan Freeman dives deeper into an intricate escape plan executed by a group of individuals on Alcatraz.

How Ted Kaczynski used his intelligence for evil and carried out targeted attacks that grew from his hatred towards technology.

In 1980, an 8-year-old finds rotted $20 bills buried in dirt—cash that investigators link to one of America’s most famous unsolved cases.

An elite crew of Italian thieves targets the vault of the Antwerp World Diamond Centre. After 27 months of planning, they execute their ambitious and intricate plan and make off with more than $100 million in diamonds, gems and cash.

Discover 11 of the biggest scandals of the past century, from the Teapot Dome Scandal to the downfall of Jeffrey Epstein.