Hired in 1921, James E. Amos was the first Black agent to work publicly for the FBI and worked high-profile cases involving murder, organized crime, Nazi spies and more during his 30-plus years of service.

One expert says priests in Mexico are targeted because they work in direct opposition to the interests of organized crime, which in many instances has infiltrated or overrun law enforcement throughout the country.

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