Summary

Robert H. Jackson Dennis v. United States — Concurring Opinion

I do not suggest that Congress could punish conspiracy to advocate something, the doing of which it may not punish. Advocacy or exposition of the doctrine of communal property ownership, or any political philosophy unassociated with advocacy of its imposition by force or seizure of government by unlawful means could not be reached through conspiracy prosecution. But it is not forbidden to put down force or violence, it is not forbidden to punish its teaching or advocacy, and the end being punishable, there is no doubt of the power to punish conspiracy for the purpose.
Source: Wikisource

Robert H. Jackson Dennis v. United States — Concurring Opinion

We would have to foresee and predict the effectiveness of Communist propaganda, opportunities for infiltration, whether, and when, a time will come that they consider propitious for action, and whether and how fast our existing government will deteriorate. And we would have to speculate as to whether an approaching Communist coup would not be anticipated by a nationalistic fascist movement. No doctrine can be sound whose application requires us to make a prophecy of that sort in the guise of a legal decision. The judicial process simply is not adequate to a trial of such far-flung issues.
Source: Wikisource

Robert H. Jackson Dennis v. United States — Concurring Opinion

Communication is the essence of every conspiracy, for only by it can common purpose and concert of action be brought about or be proved. However, when labor unions raised the defense of free speech against a conspiracy charge, we unanimously said:
It rarely has been suggested that the constitutional freedom for speech and press extends its immunity to speech or writing used as an integral part of conduct in violation of a valid criminal statute.
Source: Wikisource

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