High Quality Content by WIKIPEDIA articles! The Anti-Injunction Act, 28 U.S.C. § 2283, is a United States federal statute that prohibits any federal court from issuing an injunction against proceedings in any state court, except within three specifically defined exceptions. The Act was enacted on March 2, 1793 as Section 5 of the Judiciary Act of 1793, to alleviate states` fears of federal power.