Gillis may have had the most violent, fuming hatred of law enforcement of anyone in history. He loathed his nickname and is known to have rifle-whipped at least one man for saying it to his face. His partner in crime, John Dillinger, stopped him from killing the man, which would be a needless complication. Their partnership was confined to robbing banks. When Dillinger was killed, in July 1934, Gillis became Public Enemy No. 1, and the FBI’s entire Chicago-area field office came down on top of him.Gillis did not make the search a difficult one. He was so consumed with savage, intemperate rage against the police and “G-men” that, having killed one federal agent already at the Little Bohemia shootout, he initiated an audacious firefight with two cars of FBI agents in Barrington, IL, on November 27, 1934. Gillis did not have a habit of running from the police. He had a habit of chasing them. When a car with two agents spotted Gillis, his wife, and accomplice John Chase drive past, both cars did several U-turns, immediately firing at each other, with Gillis winding up in pursuit.The agents fled around a corner several blocks away, into a field, and waited in ambush, but Gillis’ engine had been shot through and he rolled to a stop in a park in the middle of the city. A second car of two more agents, Herman Hollis (who killed Charles “Pretty Boy” Floyd) and Samuel Cowley, ran the criminals down and crashed into a gas station 100 feet past them. The agents exited their vehicle under heavy automatic fire from Gillis and Chase, while Gillis’ wife ran for cover.Both parties fired from behind their vehicles, until Gillis was fatally hit in the stomach. This made him irate and he stood up, walked out into full view of the agents and over 30 witnesses, and howled, “I’m going to kill you sons-of-bitches!” opening fire with a semi-automatic .351 rifle so quickly that bystanders thought he had a machine gun. Gillis was hit six more times by Cowley’s tommy gun, all in the chest and abdomen, but did not even fall down. He stood and continued firing until Cowley was dead from bullets to the chest and throat, whereupon Hollis hit Gillis with two rounds of 12-gauge 00 buckshot in the legs, nearly detaching his right calf muscle. Gillis went down, then astoundingly got back to his feet and shot Hollis dead.As he and Chase made their getaway, picking up Gillis’ wife, he told her, “I’m done for”. He died at 7:35 that night in bed, and his wife left him in a ditch to be found.