Elmer Lincoln Irey (1888 – July 19, 1948) was a United States Treasury Department official and director of the Internal Revenue Service's lead investigative unit during the federal tax evasion prosecution of Chicago mobster Al Capone, Alphonse Gabriel Capone ( ; ] ; January 17, 1899 – January 25, 1947), sometimes known by the nickname Scarface, was an American mobster, crime boss and businessman who attained fame during the Prohibition era as the co-founder and boss, of which organization?