MR. JUSTICE BRENNAN delivered the opinion of the Court.
On April 28, 1950, the petitioner, as president of Amalgamated Bayard District Union, Local 890, International Union of Mine, Mill & Smelter Workers, filed an "Affidavit of Non-Communist Union Officer" with the National Labor Relations Board, pursuant to § 9 (h) of the National Labor Relations Act.
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