WASHINGTON — The investigation began years ago after two drug dealers got into a car accident in a small Tennessee town. What followed was a series of secret wiretaps, a shootout with police and the discovery of drugs hidden in a tractor trailer that would eventually lead federal investigators back to cartel leaders in Mexico.

What You Need To Know

Justice Department indictments have been unsealed against three leaders and two high-ranking enforcers of Mexico's United Cartels

It's the latest U.S. move against major Mexican drug operations

United Cartels is an umbrella organization made up of smaller cartels that have worked for different groups over time, and the organization holds a fierce grip over the western state of Michoacan, Mexico

The U.S. government on Thursday said it's offe

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