I don't know the ins and outs of the criminal laws in this area, but, like many Americans, I have wondered where our Federal and State authorities (particularly the Feds) have been. There seems to be a lot of evidence of illegal conduct out there - not just available through the Congressional investigation. Even an anti-conspiracy theorist like me has to wonder why large numbers of rich and powerful people haven't been charged. Anyway, here's a good article on the subject.
Don't Let Goldman off the Hook
By Eliot Spitzer