Cyrus Vance Jr., the Manhattan District Attorney, has issued a subpoena to Goldman Sachs, specifically based on the report written by Carl Levin for the Senate Permanent Subcommittee on Investigations, which showed that Goldman duped its clients by touting and selling them bond products that they ended up betting against. This big short of the mortgage market made them billions of dollars at the expense of their own clients, and they failed to disclose information to investors that would have shown them shorting the deals.