According to Wikipedia it is a Mississippi crime family. Kirksey Nix was a former leader and knew Sammy Giancana through bootlegger Darrel Ward. Jeffery Carter was known for doing the murder contracts in Louisiana and in Mississippi and seen as a caporegime in Florida along with Bobby Fabian. Peter Mule gave orders to Carter and Fabian so Mule must of been seen as a consigliere or underboss to Kirksey Nix. It seems Louisiana State Penitentiary is the "family'" HQ.