Warren v. Killory

explaining that a demonstrator waited for President Nixon’s motorcade to drive by so she could hold up a poster criticizing his administration’s foreign policy | urgent and stressful nature of the situation must be considered in determining the reasonableness of the police officer’s actions | the state “may determine not to permit two parades to proceed along the same street at the same time, or two rallies to be held simultaneously in the same part of a public park” | plaintiff injured when surgical instrument broke during operation may sue doctor, hospital, and distributor and manufacturer of instrument; “all those in custody of patient or who owed him a duty” have burden to establish their freedom from liability | class of persons displaying posters or signs critical of President Nixon | supporters of a political candidate