Federal Supremacy and State Anti-Subversive Legislation

State legislatures have been prompted by international tensions of recent years to enact new and stringent anti-subversive laws, thus adding to an already large body of statutes directed against various forms of subversion. Many of these statutes are open to serious objection on constitutional ·grounds. The purpose of this article is to examine those objections which are based upon the notion either that federal power in the area is exclusive or that Congress, expressly or by necessary inference, has pre-empted the field.