Hugo Black,
Cox v. Louisiana (379 U.S. 559…
“ As I said above, I have no doubt about the general power of Louisiana to bar all picketing on its streets and highways. Standing, patrolling, or marching back and forth on streets is conduct, not speech, and as conduct can be regulated or prohibited. But by specifically permitting picketing for the publication of labor union views, Louisiana is attempting to pick and choose among the views it is willing to have discussed on its streets. It thus is trying to prescribe by law what matters of public interest people whom it allows to assemble on its streets may and may not discuss. ”
