DETROIT - A group of foundations involved in community philanthropy for the bankrupt City of Detroit on June 13 filed a brief in the U.S. Bankruptcy Court for the Eastern District of Michigan supporting their motion to quash subpoenas filed by creditors Syncora Capital Assurance Inc. and Syncora Guarantee Inc. (the Syncora parties) (City of Detroit, No. 13-53846, Chapter 9, E.D. Mich. Bkcy.).