Mafia III

Once you have purchased four or more upgrades to Sammy's Bar, you will receive a mission entitled "Angry White Boys," which consists of members of the Dixie Mafia showing up to the bar to cause some trouble.

When this happens, exit the bar, deal with the hostiles outside, and then interact with their leader (struggling on his knees, but not yet dead). After speaking with and subduing the gang leader, return to Aunt Lilly. The achievement will unlock shortly after speaking with her.