City of Los Angeles v. County of Kern

Opinion

WERDEGAR, J.

Though federal court jurisdiction is constrained by article III of the United States Constitution principally to claims presenting a federal case or controversy or disputes between diverse parties, federal courts may assume supplemental jurisdiction over related state claims that “form part of the same case or controversy.” (28 U.S.C. § 1367(a); see Mine Workers v. Gibbs (1966) 383 U.S. 715, 725 [16 L.Ed.2d 218, 86 S.Ct. 1130] [federal jurisdiction extends to state claims that share “a common nucleus of operative fact” with a federal claim].) The assumption and retention of…