Petitioner was convicted of selling material which had been judicially declared obscene. At his trial he was not permitted to litigate the obscenity vel non of the publication which was the basis of his prosecution, even though he had not been a party to the earlier civil adjudication in which it was held obscene. We granted certiorari, 422 U. S. 1040 (1975), to consider whether this procedure comported with our decisions delineating the safeguards which must attend attempts by the States to prohibit dissemination of expression asserted to be protected by the First and Fourteenth Amendments against such interference. We reverse.

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