Money laundering was not a federal crime in America until 1986
Prosecutors could not charge Al Capone for hiding his fortune, so they convicted him of tax evasion instead.

TED-Ed · How does money laundering work? - Delena D. SpannUntil 1986, covering up the source of criminal cash was not by itself against federal law. Officials had to bring a case over a different offense, such as failure to pay taxes, even when the cover-up was clear.
That is why Al Capone, the notorious gangster who ran a vast organized crime empire, was convicted only of tax evasion. His operation earned nearly $100 million a year, worth roughly $1.4 billion now, from illicit betting, liquor smuggling, brothels, and shakedowns, yet investigators could not locate the cash. He and his men had tucked it away by putting money into businesses with hidden owners, including laundromats that took only cash.
From 1986 onward, prosecutors could take wealth simply by proving that hiding had happened, which aided cases against large operations like drug traffickers but sparked worries about privacy and official monitoring.
Questions people ask
What was the 1986 law that changed this?
It was the Money Laundering Control Act of 1986, passed as part of broader anti-crime legislation. It made it a federal offense to conceal the source of illegal proceeds and allowed the government to seize that wealth. The law became a key tool against drug trafficking organizations.
How does money laundering work today?
Investigators usually describe three steps. Placement puts dirty cash into the financial system, often through accounts tied to anonymous companies. Layering moves it around through transfers and purchases like cars, art, and real estate. Integration brings it back as seemingly clean spending through legal businesses or charities.