Explanation: Al Capone was an infamous gang leader in the 1920s and 1930s who ran a massive criminal empire out of Chicago. Despite his numerous crimes, ranging from the mundane (smuggling) to the heinous (murder), Capone was never nailed on the major crimes he was best-known for. This is in part due to an effort to cultivate good PR in the city of Chicago by appearing as a benefactor to ordinary people, in part due to the sheer power of his criminal empire being able to intimidate, disappear, or murder witnesses who proved too ‘cooperative’ with authorities, and in part because he wasn’t stupid enough to leave evidence everywhere for the then-new FBI to pick up.

However, they did eventually arrest him - on tax evasion. A charge that is much easier to prove than racketeering or extortion! All they had to do was show his taxable income (or what was implied of it by expenditures) were in excess of what he paid taxes on. They got him good, and sentenced him to 11 years in prison.

For that reason, American criminals ever since have paid their taxes. I say this almost unironically - it’s common for high-ranking members of criminal outfits in the modern day to fill out their taxes correctly, since it’s not obligatory to specify what kind of illegal activity you made your money from - just that it was made, and you are paying taxes on it!