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 "Albanian mafia"): According to the Research Institute for European and American Studies (RIEAS), Albanian mafia groups are actually hybrid organizations (various sectors of society), often involved in both criminal and political activities.
Relevant evidence: No