6. Bernard Madoff - $65 billion
Proclaimed as the worst thief in human history, Madoff leads our list of Ponzi conmen. Starting off as a humble salesman, he slowly worked his way to Wall Street. After developing the NASDAQ system, people started viewing him as a prodigy and financial genius.
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A reason for this is because he never reported any losses. This seemed suspicious to the FBI. It turns out that he was running the most complex Ponzi scheme ever, netting $65 billion in the process. After a short trial, he was sentenced to 150 years in prison.