If you nationalize a major US bank into receivership it is a triggering event for credit default swaps and could create a "meltdown" bigger than the fallout of Lehman Brothers Inc. explained David Havens of UBS Investment Bank, Jeff Fitts of Alvarez & Marsal and Ed Weisfelner of Brown Rudnick Berlack Israels LLP at The TMAThe Deal's Distressed Investing Conference in January.