During his reign, an Irish gangster named Danny Greene began competing with the Mafia for control of rackets. This resulted in a violent mob war between the Mafia and the Danny Greene gang, during which there were almost 40 car bombings in Cleveland. This time period earned Cleveland the unofficial title of "Bomb City U.S.A.". Danny was backed by mob associate and teamster John Nardi, who was killed on May 17, 1977, by a car bomb in the parking lot of the Teamster Hall in Cleveland.