The AIG Consolidated Derivative Litigation continues – this time the court grants a motion to dismiss claims against alleged co-conspirator defendants. We covered a prior ruling on a motion to dismiss in our April 29, 2009 post, where the court found that the plaintiffs had stated well-pled breach of fiduciary duty claims against certain high-ranking AIG officers who were allegedly involved in two conspiracies, viz., a “bid-rigging” conspiracy and a “fake reinsurance writing” conspiracy, as well as other illegal activities. The question raised in the most recent ruling was: “may AIG sue its co-conspirators for the harm that AIG suffered as a result of two alleged, illegal conspiracies involving AIG and those third-party conspirators?” The court answered the question in the negative, holding that the in pari delicto doctrine bars this type of suit. A primary purpose of the doctrine is to prevent courts from having to engage in “inefficient” and “socially unproductive” accountings between conspirators. Rather than assessing the conspiracy and shifting responsibility, the court held that it would leave the conspirators as they are, potentially jointly and severally liable for the harms caused by their alleged conspiratorial acts. American International Group, Inc. Consolidated Derivative Litigation, Case No. 769-VCS (Del. Ct. Chanc. June 17, 2009).