Question: Vincent Drucci was a member of the North Side Gang which was the best known rival of the crime boss known by what nickname?
Sentence (from "Vincent Drucci"): Vincent Drucci, also known as "The Schemer" (born Vincenzo D'Ambrosio; 1898 – April 4, 1927), was an Sicilian-American mobster during Chicago's Prohibition era who was a member of the North Side Gang, Al Capone's best known rivals.
Relevant evidence: Yes