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The Springfield Mafia is an Italian-American Mafia crime syndicate based in Springfield. The premier family among the Springfield Mafia is the D'Amico Crime Family.
 Soldiers and associates
 Member biographies
 Fat Tony I
Marion Anthony "Fat Tony" D'Amico is the local Mafia underboss and leader of The Springfield Mafia. He is the head of the D' Amico Family which involves his deceased cousin Fat Tony, his deceased sister-in-law Anne Maria D' Amico and his eight year old nephew Michael D' Amico.
 Fat Tony II
Fat Tony, originally known as Fit Tony, then Fit-Fat Tony, became the underboss after the original Fat Tony died.
 Legs and Louie
Legs and Louie are the two Springfield Mafia hitmen and fellow caporegimes who accompany Fat Tony at all times.
 Johnny Tightlips
Johnny Tightlips is a member of the Mafia and associate of Fat Tony. He says very little, which spares him from accusations of being a "squealer," but his reticence tends to be unhelpful to himself or others.
When there was a shoot-out in Fat Tony's mansion and Tightlips was shot by accident. When asked where he's injured, he says " I ain't sayin' nuthin'!", and when asked what to tell the doctor he says, "Tell 'im to go suck a lemon."
 Frankie the Squealer
Frankie the Squealer, is another member of the Mafia and associate of Fat Tony. However, he does not appear to be very useful to his colleagues in criminal activity due to his uncontrollable habit of squealing (he claims that "it makes me feel big"). On several occasions, the mob has attempted to kill him for his squealing, though they have repeatedly been unsuccessful.
 Business dealings
Their headquarters are located at the Legitimate Businessman's Social Club.
 Other mafia families facing the D'Amico Crime family
 Calabresi Crime Family
The Calabresi family is one enemy of the mafia but they are not main enemies, and eventually they are poisoned and die.
Boss : Dante Calabresi, Sr. (deceased)
 Castellaneta Crime Family
The Castellaneta family is another mafia in Springfield. Although the two mafias rarely engage each other, they are still enemies and will occasionally.
Boss: Don Castellaneta