An adviser or counselor, especially to a capo or leader of an organized crime syndicate. He is the one that keeps peace between Families, and is also third in line in La Costa Nostra(This Little Thing Of Ours)right under the Underboss and Don.
A senior advisor with the cunning and ruthlessness needed to defeat an enemy during times of open conflict. Unconstrained by the caution and deliberationcalled for during regular business order.
Tom Hagen advised the Corleone's well as it grew into the Mafia's pre-eminent family; but he wasn't a wartime consigliere.