http://www.talkingpointsmemo.com/archives/2009/03/lowdown_on_aig.php
"By law, the Fed isn't allowed to buy assets -- it can only lend, as lender of last resort. That was a problem for the Bear Stearns bailout, because JP Morgan said it would only buy Bear if someone else assumed responsibility for the crap. Fed came up with this idea to start a shadow company, called a special purpose vehicle (SPVs were how Enron operated, creating "Chewco" and the like named after Chewbacca - the New York Fed called their SPV "Maiden Lane LLC" for name of the street the NY Fed is located on in southern Manhattan)..."