Mugshot of Alphonse Capone following his 1930 arrest on charges of tax evasion
In 1931 Capone was indicted for income tax evasion and various violations of the Volstead Act. Facing overwhelming evidence, his attorneys made a plea deal, but the presiding judge warned he might not follow the sentencing recommendation from the prosecution, so Capone withdrew his plea of guilty. Attempting to bribe and intimidate the potential jurors, his plan was discovered by Ness's men. The venire (jury pool) was then switched with one from another case, and Capone was stymied. Following a long trial, he was found guilty on some income tax evasion counts (the Volstead Act violations were dropped). The judge gave him an eleven-year sentence along with heavy fines, and liens were filed against his various properties. His appeal was denied.
National Archives, Image of Jury Verdict in the Capone Trial
FBI, Famous Cases: Alphonse Capone
FBI Files on Al Capone
"Al Capone," Wikipedia
Tru TV Crime Library, "Al Capone -- Made in America"
Al Capone's Tax Trial and Downfall
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