In a bust on Friday, Thai police arrested four executives on charges of operating a pyramid scheme selling a cryptocurrency called Utoken, and stealing over 10 billion baht (roughly US$310 million).
http://www.coinbuzz.com/2015/04/13/arrests-in-ufun-crypto-currency-pyramid-scheme/Definitely one of the biggest bitcoin-related scams in recent times. I myself have not heard of Utoken before, and they stole 1/3 billion USD.
Makes me wonder how many other scams/ponzis are still running out there and how much money they have. Your thoughts?