“Tom Hagen: Sollozzo is known as the Turk. He's supposed to be very good with a knife. But only in matters of business, or of some sort of reasonable complaint. His business is narcotics. He has the fields in Turkey, where they grow the poppy. In Sicily he has the plant to process it into heroin. He…”
— Mario Puzo, Francis Ford Coppola, Tom Hagen, Robert Duvall, imdb.com