Operation Family Secrets was an FBI investigation of mob related crimes in Chicago. According to the FBI it was one of the most successful investigations of organized crime done by the FBI ever.[1] The investigation and trial was accurately dubbed "Family Secrets" because of the betrayal within the Calabrese family. The son, Frank Calabrese, Jr., and brother, Nick Calabrese, of a Chicago Outfit mob hit man, Frank Calabrese, Sr. provided testimony that was instrumental to the success of Operation Family Secrets. The investigation led to indictments of 14 defendants affiliated with the Chicago Outfit, which has been one of the most prolific organized crime enterprises in the United States.[2] The most heinous of their crimes investigated were the 18 murders and one attempted murder that took place over the span between the years 1970 and 1986. All of the murders and other crimes being charged to the defendants were allegedly committed to further the Outfit's illegal activities such as loansharking, bookmaking and protecting the enterprise from law enforcement. Operation Family Secrets was a milestone in the FBI's battle against organized crime in the city of Chicago that will have a significant effect on the operations of the Chicago Outfit, but it did not end the Outfit's reign in Chicago. The FBI and local law enforcement agencies will continue their efforts to eradicate organized crime in Chicago.[3]