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(a) When a federal statute completely pre-empts a state law cause of action, the state claim can be removed. See Beneficial Nat. Bank v. Anderson,, 8. ERISA is such a statute. Because its pur pose is to provide a uniform regulatory regime, ERISA includes expansive pre-emption provisions, such as ERISA § 502(a)'s integrated enforcement mechanism, which are intended to ensure that employee beneﬁt plan regulation is "exclusively a federal concern," Alessi v. Raybestos Manhattan, Inc.,, 523. Any state law cause of