| Show Slang |
| Bull: A policeman. |
| Chopper: Slang term for a Thompson submachine gun. Also called a Tommy gun. |
| Dough: Money |
| Enforcer: Member of Mob hierarchy who makes sure that its policies and edicts are carried out. |
| Fed: A Federal agent. |
| Grease: Money used for bribery. |
| Gunsel: A gunman. |
| Hatchet man: A triggerman, gunman, or gunsel. |
| Junk: Narcotics. |
| Mouthpiece: A lawyer. |
| Rap: A criminal offense. |
| Stoolie: An informer to the law regarding illegal activities. Also called stool pigeon. |
| Torpedo: A gunman. |
| Untouchables: Name given to an elite group of Federal agents led by Eliot Ness. So-called because they were untouched by bribery money. |