Salerno served as consigliere, underboss, and acting boss of the Genovese family.
From the en.wikipedia.org
Megale's attorneys have maintained that he is not the underboss of the Gambino family.
From the foxnews.com
A capo is appointed by the boss and reports to him or the underboss.
From the en.wikipedia.org
The son of a mob underboss tries to win his father's respect by collecting a half-million dollar payment.
From the post-gazette.com
At the time of his stroke, Salerno was Genovese underboss.
From the en.wikipedia.org
The underboss spilled the grim details.
From the time.com
The underboss is usually appointed by the boss.
From the en.wikipedia.org
The underboss often runs the day-to-day responsibilities of the family or oversees its most lucrative rackets.
From the en.wikipedia.org
His son Charley is underboss and chief enforcer for the family, a geratic Brooklyn Mob headed by Corrado Prizzi, 84.
From the time.com
More examples
An assistant or second-in-command to a chief (especially in a crime syndicate)
Capo Bastone or "Sotto Capo", known as the "Underboss" is second in command to the Capo Crimini. It is a rank in the American and Italian Mafia. The Underboss is sometimes a family member, such as a son, who will take over the family if the don is sick, killed, or sent to prison. ...
Underboss (ISBN 978-0-06-109664-8) is a biographical book based on the life of Sammy "The Bull" Gravano. The book goes though Gravano's early life up to 1997, which does not cover his re-arrest. The book's author is Peter Maas, who also wrote the book The Valachi Papers. ...
An assistant to the boss of a crime family
Second in command of a borgata. The underboss is often selected because he represents a powerful minority wing in the family.