Investigation of alleged wire tapping. hearings before a subcommittee of the Committee on Interstate Commerce, United States Senate, Seventy-sixth Congress, third session pursuant to S. Res. 224 (76th Congress), a resolution authorizing and directing an investigation of alleged wire tapping and installation of listening or recording devices. Part 2, November 18, 19, 20, 26, and December 11, 1940 :

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