The Gambino and Bonanno crime families struggled over the mozzarella cheese business in Pennsylvania, South New Jersey, Delaware and Pennsylvania. An FBI sting operation in Buffalo, New York began the unraveling of a Gambino family operation that smuggled heroin into the United States from Milan, Italy. A prominent Milan banker worked hand in hand with Rosario and Giuseppe Gambino. He caused the ruin of Italian financial institutions as well as the the Franklin National Bank, the 20th largest in the U.S. in 1979.