This society sends people to jail for tax evasion all the time, even if the original source of their income was non-criminal.
Al Capone was guilty of running a massive criminal organisation responsible for many many crimes (very difficult to prove due to structures of organised crime). He was also guilty of massive tax evasion (a crime carrying serious jail time), because it turns out it's hard to pay the right tax bill when you're trying to hide the income from your massive criminal enterprise.
The Capone tax case wasn't some made up crime to try pin him. He committed serious tax evasion, which would also carry severe penalties if you or I did it at that scale with legitimate income.
Al Capone was guilty of running a massive criminal organisation responsible for many many crimes (very difficult to prove due to structures of organised crime). He was also guilty of massive tax evasion (a crime carrying serious jail time), because it turns out it's hard to pay the right tax bill when you're trying to hide the income from your massive criminal enterprise.
The Capone tax case wasn't some made up crime to try pin him. He committed serious tax evasion, which would also carry severe penalties if you or I did it at that scale with legitimate income.