 In April 1930, their efforts resulted in Ralph Capone's conviction for tax fraud, but the Intelligence Unit still lacked enough evidence to build a case against his brother Al.In March 1930, attorney Frank J. Loesch of the Chicago Crime Commission asked President Herbert Hoover to take down Al Capone, adding additional impetus to the Intelligence Unit's efforts.Tax investigators in Chicago suspected that a large amount of Capone's income came from his interest in a race track for dogs, called the Hawthorne Kennel Club, in Cicero, run by a lawyer named E. J. O'Hare.