The indictment tells the story of cyberlockers in a perfect narrative — how the owners of the site knew that their site was a massive clearinghouse of stolen content, they profited from it, and they did whatever they could to mask it.
The charges include Racketeering, conspiracy to commit copyright infringement, and money laundering.
It looks like the Department of Justice cooperated with foreign law enforcement to actually take the owners of the site into custody. (source)