What did Al Capone do while in the pen for tax evasion and contempt of court?

A letter now on auction sums up his leisure activities in two words: prison band. A 1938 letter from Capone to his son is currently for sale at RR Auctions, a Boston-based auction house that specializes in rare manuscripts.
It’s a rare letter, indeed—the missive, which is expected to bring in more than $50,000, gives an intimate look at the daily life of one of the most hardened gangsters in American history.
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