The Seventh Circuit has struck down a common feature of preliminary approval orders of federal class action settlements. The Seventh Circuit held that a federal court may not preliminarily enjoin class members from prosecuting related state lawsuits while the court decides whether to give final approval to the class settlement.  Adkins v. Nestlé Purina PetCare Co., No. 14-3436, 2015 WL 864931 (7th Cir. Mar. 2, 2015).

These types of preliminary injunctions are commonly used in a broad range of consumer and other class settlements, and they are particularly important when a defendant is facing several competing class actions on the same issue.  But the Seventh Circuit held that these injunctions violate the Anti-Injunction Act, 28 U.S.C. § 2283—even though the court acknowledged that federal settlements “may well collapse” if state actions go to judgment before federal courts can approve the settlements.    
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