Here's the CliffsNotes version of the scandal: Back in 2007, Harvard-educated hedge-fund whiz John Paulson (no relation to then-Treasury secretary and former Goldman chief Hank Paulson) smartly decided the housing boom was a mirage. So he asked Goldman to put together a multibillion-dollar basket of crappy subprime investments that he could bet against. The bank gladly complied, taking a $15 million fee to do the deal and letting Paulson choose some of the toxic mortgages in the portfolio, which would come to be called Abacus.
This is just one of many examples of how big banks have played the market from both ends and have defrauded their customers. This is why we need new sweeping reform in how our banks and financial institutions are regulated.