During the 1920s at the peak of organized crime, Al Capone rose to prominence as one of the most powerful gangsters in the United States, running a multi-million dollar operation in Chicago. The man who ultimately took down Capone, through forensic accounting, was Frank J. Wilson. As a special agent in the IRS, Wilson was able to pioneer forensic accounting in the investigation that exposed Capone’s unreported gambling activities and income. Wilson effectively combined forensics with the new idea of handwriting analysis, otherwise known as graphology, which led to the razing of Chicago’s, as likely as not the United States's, most powerful gang. Wilson would later go on to apply his new discoveries in the field of forensic science to the investigation