Aniello Dellacroce, also infamously known as "The Tall Guy," "Father O'Neil" and "Mr. Neil," was a gang member of the Italian Mangano crime family (later the Gambino gangster family) operating in New York. He began as a capo and soon climbed up the ladder within the organized crime family. He was a tall man with deep-set eyes and broad shoulders that intimidated most men. He carried out various illegal activities, including racketeering, theft, hijacking, extortion, and even alleged murders for the Gambino boss. He trained his underling John Gotti who eventually became the Gambino boss. He was sometimes referred to as "the Polack," a derogatory slang alluding to his square-shaped face, behind his back. He was also referred to as “Father O’Neil” because he often disguised himself as a priest to evade the authorities and rival gangsters. It is alleged that he even murdered a man while dressed as a priest. He was a man who liked to keep a low profile, and it was rumored that he used body doubles so that he could carry out his activities while the authorities chased the doubles. Several former detectives, investigators, and news reporters have described his eyes, saying they were of a killer, without a hint of any emotion, devoid of any soul and frightening.