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What role did mafias play in the Second World War, in Italy, the US, or elsewhere? by /u/Al_Scarface_Capone

What was the extent of the Italian Mafia's contribution to the American war effort during WW2? by /u/salvyepps

And this one's about Mussolini's crackdown on the mafia:

What did the Mob do during WW II? by /u/Talleyrayand

This previous list was provided by u/knoperope and will probably help.