Question: Which "boss of bosses" Mafia member was behind the murder of New York City police sergeant Joseph Petrosino?
Sentence (from "Max Finkelstein"): As president of Shomrim, a fraternal order of Jewish New York City police officers, he became famous in 1938 when Fiorello H. La Guardia picked him to lead a special squad, whose job was to safeguard visiting officials from Nazi Germany and guard the German consulate.
Relevant evidence: No