The motives for Eric Harris and Dylan Klebold to carry out the Columbine High School massacre had nothing to do with bullying or revenge — and the real truth is even more disturbing.

From 1868 to 1945, the Empire of Japan reigned as a formidable world power — and perpetrated some of history's worst war crimes before and during World War II.

A team of former FBI and CIA operatives, the "White House plumbers" were tasked with stopping information leaks that made the president look bad and fighting back against his enemies. Then things went terribly wrong.

One of the infamous "plumbers" in Richard Nixon's White House, G. Gordon Liddy was the mastermind behind the Watergate scandal.

Today, H. H. Holmes lives on in infamy as "America's First Serial Killer," but the story we've all been told may not be completely true.

The Unabomber's reign of terror lasted for 17 years and sparked the biggest manhunt in FBI history. But what drove Ted Kaczynski to murder?

Discover the true story of "Murder Among the Mormons," from Mark Hofmann's white salamander letter forgery to his 1985 bombings.

Shiro Ishii ran Unit 731 and performed cruel experiments on prisoners until he was apprehended by the U.S. government — and granted full immunity.

After the war, many Japanese soldiers claimed they only ate human flesh because they were starving. But in most cases, the evidence tells a different story.

For Watergate ringleader E. Howard Hunt, the crimes he committed on behalf of Richard Nixon pale in comparison to the crimes he committed on behalf of his country.

Starting with its first street gang in the early 1800s and continuing with its most recent mob boss assassination in March 2019, New York's history of gangs is as gruesome as it is complicated.