What legal basis existed for McCarthyism?
        
        
     
    
 replied to:  Atherant
         
        
            
            Replied to:  What legal basis existed for McCarthyism?
         
        The Alien Registration Act or Smith Act of 1940 made it a crime to try to overthrow the federal government.
        
        
     
    
 replied to:  jharrington
         
        
            
            Replied to:  The Alien Registration Act or Smith Act of 1940 made it...
         
        Eleven Communist leaders were convicted under the Smith Act in 1949.