Following a 2015 burglary and fire at the House of Blues music studio in Memphis, Tennessee, a jury awarded $2.5 million to defendant John Falls pursuant to his insurance policy with plaintiff Hanover American Insurance Company. Despite that judgment in Falls’s favor, the parties continue to fight over whether Falls is entitled to that entire award. Falls filed suit against defendants Christopher Brown and Tattooed Millionaire Entertainment, LLC (TME) in Tennessee state court, and Hanover filed an interpleader action against Brown, TME, and Falls in federal court. Hanover then moved the federal district court to enjoin Falls’s state-court proceeding. The court granted the injunction, concluding that doing so was “necessary in aid of its jurisdiction” under the Anti-Injunction Act, 28 U.S.C. § 2283. We disagree and reverse.