“…Thus, Section 4(a) makes it a felony, subject to ten years' imprisonment and a $10,000 fine, "for any person knowingly to combine, conspire, or agree with any other person to perform any act which would substantially contribute to the establishment within the United States of a totalitarian dictatorship" under foreign control. This is by far the vaguest and most sweeping sedition statute ever enacted in the United States. …”