Working as an informant for the FBI is dangerous, undercover work. Hear from writer Jeanette Hurt on how her dad, an unexpected FBI informant, helped expose corruption at the Chicago Truck Drivers, Helpers and Warehouse Workers Union.

The U.S. originally started the federal witness protection program to protect people from the mob. And the people who received protection? They were usually part of the mob too.

Dominick Polifrone gained the confidence of the contract killer in an undercover operation that almost cost him his life.

Sheriff Jonathon Horton talks about his journey from the Navy to Etowah County, and the eye-opening nature of his department's '60 Days In' experience.

In three decades as an undercover operative for the Bureau of Alcohol, Tobacco, Firearms and Explosives, Vincent A. Cefalu risked his life investigating groups from outlaw motorcycle gangs to the Ku Klux Klan. Cefalu spoke with us about the undercover moments that frightened him most.

There is a history of investigators, reporters, and even regular people (like the volunteers on 60 Days In) going undercover in prison to expose wrongdoing, danger, and bad treatment. Read inspiring stories of intrepid souls who went behind bars to find truth.