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The Anti-Injunction Act is a U.S. federal statute enacted in 1793. The Act prohibits the federal court from issuing injunctions against proceedings in any state court. The Act aims to eliminate the fear of states over the federal powers. However, there are exceptional situations where a federal court can grant injunctions. Such exceptional situations are:
1. the injunction is expressly authorized by Congress;
2. the injunction is necessary in aid of the federal court's jurisdiction; and
3. the injunction is to protect or effectuate federal judgments.
This Act is codified at 28 USCS § 2283