The word for today is…
consigliere (noun):
: a person who serves as an adviser or counselor to the leader of a criminal organization
Source : Merriam -Webster
Etymology : The word consigliere comes from Italian and has been a part of English since the 17th century; it was originally used of someone who served on a council in Italy. Currently, it most commonly refers to advisers to the Mafia—a use that first appeared in English in a document from a 1963 session of the U.S. Senate. It is also used more generally for someone who is likened in some way to such an adviser.
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