Bivens v. Six Unknown Named Agents, 403 U.S. 388 (1971), was a case in which the US Supreme Court ruled that an implied cause of action existed for an individual whose Fourth Amendment freedom from unreasonable search and seizures had been violated by the Federal Bureau of Narcotics. The victim of such a deprivation could sue for the violation of the Fourth Amendment itself despite the lack of any federal statute authorizing such a suit. The existence of a remedy for the violation was implied by the importance of the right violated.