Al Capone Mabel Walker Willebrandt recognized that mob figures publicly led lavish lifestyles yet never filed tax returns, and thus could be convicted of tax evasion without requiring hard evidence to get testimony about their other crimes. She tested this approach by prosecuting a South Carolina bootlegger. In 1927, the Supreme Court ruled in "United States v. Sullivan" that illegally earned income was subject to income tax; Justice Oliver Wendell Holmes Jr. rejected the argument that the Fifth Amendment protected criminals from reporting illegal income. The IRS special investigation unit chose Frank J. Wilson to investigate Capone, with the focus on his
Al Capone Americans. Capone continued to back Thompson. Voting booths were targeted by Capone's bomber James Belcastro in the wards where Thompson's opponents were thought to have support, on the polling day of April 10, 1928, in the so-called Pineapple Primary, causing the deaths of at least 15 people. Belcastro was accused of the murder of lawyer Octavius Granady, an African American who challenged Thompson's candidate for the African American vote, and was chased through the streets on polling day by cars of gunmen before being shot dead. Four policemen were among those charged along with Belcastro, but all charges were dropped