In 2009, Bernie Madoff pleaded guilty to a Ponzi scheme that cost investors an estimated total of $65 billion, the largest in U.S. history. Before that, he had been a respected member of the financial and trading communities, and was even the chairman of the NASDAQ stock exchange, a penny stock broker, and an investment advisor.
When his scam finally came crumbling down, he would be sentenced to 150 years in a federal prison. Madoff died in prison in 2021. https://en.wikipedia.org/wiki/Bernie_Madoff#Plea,_sentencing,_and_prison_life
This video, which is available on YouTube, is from an NBC News TV segment profiling the Madoff Ponzi scheme and accounting scandal.