Theres a rumour that "Machine Gun" Jack McGurn was a drug addict.Theres a story that after the killing of McGurn,Paul Ricca said something like “High and dry,that’s why we left him…sellin’ junk to the moolies”

Also Kansas City mobster James"Jimmy Needles"LaCapra was a heroin addict.He organized the hit on Johnny Lazia abd after that i think he became an informant.