The Federal Bureau of Investigation(FBI) is looking for help tracking down three fugitives of an alleged drug trafficking organization.

Agents said William "Chill Will" Gavin(Center) is associated with the 49 BAD Bloods, which they say is considered one of the most violent street gangs in St. Louis. Leaha Hazza(Left) and Brian Knight(Right) live in Phoenix and are couriers for the organization.

In the two years since the start of the investigation, the FBI said they have seized 4.5 kilograms of cocaine, two kilograms of heroin, 4.75 pounds of marijuana and $28,000 of cash en-route to St. Louis from Phoenix.

Anyone with information about any of the three fugitives is asked to contact the U.S. Marshals in St. Louis, Missouri at 314-280-6128.

Photos: 2016 STL area mug shots