U.S. indicts suspected Russian 'mastermind' of $4 billion bitcoin laundering scheme BTC-e exchange
Alexander Vinnik, a 38 year old Russian man suspected of running a money laundering operation
http://www.reuters.com/article/us-greece-russia-arrest-idUSKBN1AB1OP
This is another reason why you should not keep coins on exchanges. If you don't control the private key, you don't really own the coin.
Yes it's been difficult now a days crypto currency crisis, scammers a lotting everywhere, in everyway