Frank "the Prime Minister" Costello (January 26, 1891 – February 18, 1973), born Francesco Castiglia, was an Italian gangster and crime boss. Costello rose to the top of America's underworld, controlled a vast gambling empire across the United States and enjoyed political influence. Nicknamed "the Prime Minister of the Underworld," he became one of the most powerful and influential mob bosses in American history, eventually leading the Luciano crime family (later called the Genovese crime family