8. Raj Rajaratnam This Sri Lanken former billionaire made his money through the Galleon Group, a hedge fund management firm that was known to manage about $7 billion before it closed its doors in 2009.
The firm closed abruptly in October that year, when Rajaratnam was arrested under suspicion of insider trading.
In 2011 he was found guilty and sentenced to 11 years behind bars, and was ordered to pay an unprecedented $92.8 million penalty.