Brief For Amicus Curiae American Associationfor the Advancement of Slavic Studies, AmericanBooksellers Foundation for Free Expression,American Studies Association, Association ofAmerican Law Schools, Association of AmericanPublishers, Association of American UniversityPresses, College Art Association, Latin AmericanStudies Association, Middle East StudiesAssociation, National Coalition Against Censorshipin Support Of Plaintiffs-Appellants