At the height of the Cold War, the Supreme Court upheld the portions of the Taft-Hartley Act (1947) that required labor union leaders to sign an affidavit affirming that they were not presently members of the Communist Party.
The Communications union, which had a record of some Communist Party infiltration, charged that the registration provisions of the Taft-Hartley Act of 1947 violated the freedoms provided by the First Amendment. Speaking for a 5-1 majority, Chief Justice Fred M. Vinson
Douds may be contrasted with United States v. Brown
Clear and present danger test
Cumming v. Richmond County Board of Education
Speech and press, freedom of