Question: What criminal organization did James Marcello and Joseph Lombardo work for? 
Sentence (from "Organized crime"): Gambetta's classic work on "the Sicilian Mafia" generates an economic study of the mafia, which exerts great influence on studies of "the Russian Mafia", "the Chinese Mafia", "Hong Kong Triads" and "the Japanese Yakuza".
Relevant evidence: No