National defense. Wire tapping for national defense, hearings before subcommittee no. 1, 76th Congress, 3d session, on H. J. Res. 553, to authorize Federal Bureau of Investigation of Department of Justice to conduct investigations in interests of national defense, and for that purpose to permit wire tapping, subsequently amended, reintroduced and reported as H. J. Res. 571, June 12, 1940.

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