To discourage misinformation, here's a copied and pasted summary for those who aren't going to read the whole thing: According to the SEC's complaint, filed in

To discourage misinformation, here's a copied and pasted summary for those who aren't going to read the whole thing: According to the SEC's complaint, filed in U.S. District Court for the Southern District of New York, the marketing materials for the CDO known as ABACUS 2007-AC1 (ABACUS) all represented that the RMBS portfolio underlying the CDO was selected by ACA Management LLC (ACA), a third party with expertise in analyzing credit risk in RMBS. The SEC alleges that undisclosed in the marketing materials and unbeknownst to investors, the Paulson & Co. hedge fund, which was poised to benefit if the RMBS defaulted, played a significant role in selecting which RMBS should make up the portfolio. The SEC's complaint alleges that after participating in the portfolio selection, Paulson & Co. effectively shorted the RMBS portfolio it helped select by entering into credit default swaps (CDS) with Goldman Sachs to buy protection on specific layers of the ABACUS capital structure. Given that financial short interest, Paulson & Co. had an economic incentive to select RMBS that it expected to experience credit events in the near future. Goldman Sachs did not disclose Paulson & Co.'s short position or its role in the collateral selection process in the term sheet, flip book, offering memorandum, or other marketing materials provided to investors.