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 1, May 21, 22, 23, 28, 29, and June 4, 5, 6, and 12, 1940 :

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