Robert H. Jackson, American Communications Association v…
“ But while I think Congress may make it a crime to take one overt step to use or to incite violence or force against our Government, I do not see how in the light of our history, a mere belief that one has a natural right under some circumstances to do so can subject an American citizen to prejudice any more than possession of any other erroneous belief. Can we say that men of our time must not even think about the propositions on which our own Revolution was justified? ”
