Murray Humphreys late 1920s to the early 1930s, Humphreys, along with "Red" Barker, William "Three-Fingered Jack" White and William "Klondike" O'Donnell, was one of the mobsters who orchestrated the Outfit's takeover of a number of Chicago labor unions. Humphreys was later indicted for the December 1931 kidnapping of a union president, Robert G. Fitche, but escaped conviction. In 1933, with Capone behind bars for income tax evasion, the chief investigator for the State Attorney's office described Murray Humphreys as "'public enemy No. 1' and 'the czar of business rackets in Chicago.'" Later that same year, Humphreys was indicted for income tax evasion
Tax evasion in the United States show (1) the existence of a tax deficiency (an unpaid federal tax), (2) an affirmative act constituting an evasion or attempted evasion of either the assessment or payment of that tax, and (3) willfulness (connoting the voluntary, intentional violation of a known legal duty). A genuine, good faith belief that one is not violating the Federal tax law based on a misunderstanding caused by the complexity of the tax law is a defense to a charge of "willfulness", even though that belief is irrational or unreasonable. A belief that the Federal income tax is invalid or unconstitutional is not a