IBP, inc. yesterday filed suit in U.S. District Court against Andrew J. Zahn, former owner of the companies that came to be operated by IBP as DFG Foods, LLC. In addition to being one of the principle owners of the companies prior to their sale to IBP, Zahn also was Chief Executive Officer of DFG Foods, LLC under IBP's ownership and an officer of IBP's Foodbrands America, Inc. subsidiary.