United States Federal Witness Protection Program
On February 21, 2003, Chicago Tribune columnist John Kass broke the story that Calabrese was talking to the Federal Bureau of Investigation, and noted that Calabrese had disappeared from the federal prison in Milan, Michigan, and that Calabrese's federal prison records had disappeared altogether, leading Kass to believe that Calabrese had entered the United States Federal Witness Protection Program. FBI agents also had spread out across the country with search warrants, collecting DNA evidence, hair cuttings and oral swabs from many reputed Chicago Outfit members.