28 USC § 2283. Stay of State court proceedings
*Current through Public Law 112-173, August 16th, 2012.
A court of the United States may not grant an injunction to stay proceedings in a State court except as expressly authorized by Act of Congress, or where necessary in aid of its jurisdiction, or to protect or effectuate its judgments.(June 25, 1948, ch. 646, 62 Stat. 968.)