In re Neagle (1890)
The Supreme Court held that a state could not prosecute a U.S. marshal for killing a judge's assailant while protecting the judge on duty. The Court ruled federal officers acting within their duties are protected from state prosecution.
The marshal was freed from state charges.
For 135 years, the case has shielded federal officers from state accountability and limited how states regulate federal operations.
CalMatters reports this is the precedent likely to block California's new law requiring state prosecutors to investigate shootings by immigration agents.
