Question: The Valachi hearings, also known as the McClellan hearings, investigated organized crime activities across America, the hearings were named after which American gangster, notable as the first member of the Italian-American Mafia to publicly acknowledge its existence,was a major government witness against the American Mafia?
Sentence (from "Black Mafia"): The organization began as a small criminal collective, known for holding up neighborhood craps games and dealing in the illegal drug business, but at its height of operation until about 1975, it managed to consolidate power and control a large portion of criminal activity in various African-American neighborhoods throughout Philadelphia, the Delaware Valley, and South Jersey, including Atlantic City.
Relevant evidence: No