Tech Insider : Business, Style

Mike Dowd is a former New York City Police Department officer who became involved in drug dealing while on the force. He was arrested in 1992 and later convicted of racketeering and conspiracy to distribute narcotics, serving 12 years in federal prison.

Tech Insider : Business, Style

Frank D'Alesio is a retired special agent for the Bureau of Alcohol, Tobacco, Firearms and Explosives who spent nearly two decades embedded in investigations targeting outlaw motorcycle clubs.

Tech Insider : Business, Style

Eric Immesberger posed as a hit man in undercover operations to gather evidence against people attempting to hire one.

Tech Insider : Business, Style

Eric King served almost two years at the federal super-maximum security prison ADX Florence in Colorado.

Tech Insider : Business, Style

Nick Leeson is an English former derivatives trader who caused the collapse of Barings, London's oldest merchant bank, which had operated for 233 years. Working in the bank's Singapore office, he made a series of unauthorized speculative trades that ultimately lost $1.2 billion.

Tech Insider : Business, Style

Brett Johnson is a reformed internet fraudster who stole more than $1 million through stolen credit cards, counterfeit documents, and phishing schemes.

Tech Insider : Sports, Business, Style

Owen Hanson is a former college athlete who ran an illegal sports betting company and later expanded into international cartel-backed money laundering and drug trafficking.

Tech Insider : Business, Style

Richard Marcus was a casino cheat in Las Vegas for 25 years. He says he used a mixture of chip scams and social engineering to con casinos such as Caesars Palace, the MGM Grand, and the Riviera out of millions of dollars. Though he was tailed by private investigators, he was never caught.

Tech Insider : Business, Style

David Packouz is a former arms trader. In 2005, he joined the arms dealer Efraim Diveroli at AEY, bidding on contracts for the US military. In 2007, AEY won a $300 million contract to supply munitions to Afghanistan. Packouz was part of a cover-up to disguise the true identity of the ammunition, concealing that it was of Chinese origin.

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Chet Sandhu is a former smuggler. He estimates that he trafficked over $50 million worth of illegal steroids. In the mid-1990s, Sandhu operated a steroid-trafficking network that sourced its supply from Karachi, Pakistan, and transported it via routes including the Netherlands, France, and Spain to the United Kingdom by bribing airport security.