THOMAS v. COLLINS
A Texas law required union officials to obtain an organizer's card before soliciting possible members. A judge convicted a labor organizer of contempt for speaking at a union rally without a permit.
Does the Texas law requiring labor organizers to secure permission to solicit members violate the Free Speech Clause of the First Amendment?
Yes, the law was unconstitutional. It interfered with freedom of speech and freedom of assembly which possesses "a sanctity and a sanction not permitting dubious intrusions."