Goldman Sachs: Playing Both Sides?

There is scuttlebutt in the markets that Goldman Sachs, while creating the SIV vehicles based by mortgage loans that issued the CDOs that had caused such massive write downs, was, at the same time shorting the sub prime market.  It took fees for creating the SIVs and investment gains on the short positions.  If true, this should attract the attention of the class action plaintiff lawyers.