Cylinder Gas, Chemical, Petroleum, Auto-Service & Accessory Drivers, Local No. 283 v. Ottawa Silica Co.

prosecutorial immunity not available when a civil rights claim "focuses on a prosecutor's actions in the course of directing police investigative activity” | attempted suit against Mayor and Police Superintendent on theory that they knew of a conspiracy by their subordinates against the plaintiffs | attempted suit against Mayor and Police Superintendent on theory that they knew of a conspiracy by their subordinates against the plaintiffs | attempted suit against Mayor and Police Superintendent on theory that they knew of a conspiracy by their subordinates against the plaintiffs | "the State's Attorney's alleged participation in the planning and execution of a raid of this character has no greater claim to complete immunity than activities of police officers allegedly acting under his direction" | “the State’s Attorney’s alleged participation in the planning and execution of a raid of this character has no greater claim to complete immunity than activities of police officers allegedly acting under his direction” | availability of immunity depends on character of conduct under attack | nature of prosecutor's immunity depends upon character of conduct | nature of prosecutor’s immunity depends upon character of conduct | use is bar where not purely experimental | Justice Stevens, then circuit judge