A former Citigroup executive who acted as broker to the convicted chief of Worldcom is suing the law firm that advised the bank on his severance package over a conflict of interests.

David Trautenberg, the former co-head of Citigroup's private wealth management group and broker to WorldCom chief Bernard Ebbers, claimed law firm Paul, Weiss, Rifkind, Wharton & Garrison used confidential information against him when advising Citigroup in his severance pay negotiations.