Al Capone's Gang are ghostly mobsters who were loyal to Al Capone.
Al Capone's Gang spent their afterlife conducting raids on the North Side Gang and defending Capone's residence. Not much had changed since they were alive.  However, the gang was locked in eternal combat since the weapon of choice, ectoplasmic bullets, had no permanent lasting effects. 
- On page four of Ghostbusters Issue #13, one of the mobsters makes a non-canon cameo on a portrait.
- ↑ Egon Spengler (2009). The Real Ghostbusters - "The Ghostbusters Live! from Al Capone's Tomb!" (1989) (DVD ts. 13:55-14:00). Time Life Entertainment. Egon says: "The only thing they knew how to do in life so I guess this is all they know how to do now."
- ↑ Ray Stantz (2009). The Real Ghostbusters - "The Ghostbusters Live! from Al Capone's Tomb!" (1989) (DVD ts. 08:58-08:59). Time Life Entertainment. Ray says: "Those aren't bullets. They're Ectoplasm."