Q said, Follow the money…

Tax evasion-IRS investigation of Al Capone

Assistant Attorney General 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, Manley Sullivan.[66] In 1927, the Supreme Court ruled in United States v. Sullivan that the approach was legally sound: 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.

(I hate wikipedia, but here you go…)

>https://en.wikipedia.org/wiki/Al_Capone