The former head of bitcoin exchange Mt.Gox, Mark Karpeles, screwed a lot of early adopters. It is unclear at this point how much Karpeles allegedly lost or took, but the Japanese police are claiming he lost about $387 million while Mt.
5 Things to Know About Bitcoin Exchange Mt. Gox and CEO Mark Karpel�s
Wall Street Journal (blog)
Japanese cops arrest Mt Gox bitcoin chief Mark Karpeles