WILMINGTON, Del. - A group of underwriters who are creditors in the Chapter 11 bankruptcy of Overseas Shipholding Group Inc. (OSG) on June 3 filed a brief in the U.S. Bankruptcy Court for the District of Delaware arguing that OSG should not be permitted to disallow their claims for defense costs in underlying securities litigation related to the bankruptcy (In Re: Overseas Shipholding Group Inc., No. 12-20000, Chapter 11, D. Del. Bkcy.).