High Quality Content by WIKIPEDIA articles! Marcus v. Search Warrant, 367 U.S. 717 (1961), full title Marcus v. Search Warrant of Property at 104 East Tenth Street, Kansas City, Missouri, is an in rem case decided by the United States Supreme Court on the seizure of obscene materials. The Court unanimously overturned a Missouri Supreme Court decision upholding the forfeiture of hundreds of magazines confiscated from a Kansas City wholesaler. It held that both Missouri`s procedures for the seizure of allegedly obscene material and the execution of the warrant itself violated the Fourth and Fourteenth amendments` prohibitions on search and seizure without due process. Those violations in turn threatened the rights protected by the First Amendment.