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TABLE OF CONTENTS SUMMARY s * e . . ° e e * . e * * * e s * s a * td DEFINITION OF TERMS. « 2 «© © © sw ww we ws Wire Tap (also known as Wire Tap Surveillance, Telephone Surveillance, Technical Surveillance, Tesur). s «© «© # @ ee ee Microphone (also known as iicrophone Surveillance, Hisur}). . . « « . oe ee Combination Wire Tap and Microphone o 8 6 e EARLY POLICY a *. e s * a * * . * e ° a * e e . s Early Use of Microphones by FBI. . a) Bureau Authorization First Required in 1938 Instructions to Field, 1941, 1944 ..... LEGAL INTURPROTATIONS. « « © © © ee ew we te Supreme Court Decision in Goldman Case, 1942. FBI Distinction Ectween Technical and Microphone Surveillances, 1943. ... . Legal Guidance Sought from Department, 1944 Instructions to Field, 1944, 1945 ..... Legal Guidance Obtained fron Department, 1946 $ 19 47 . e o * * a s e * * * * * . Co ° Review of Bureau Policy by Executive Conference, June 9, 1950. . . 2. « « « « « Department's Continuing Awareness of Microphone Surveillances. . . ..+ +e. Issue of Hicrophones Involving Trespass Presented to Department . . Attorney General UcGrath Will Not Authorize Microphones Involving Trespaas, Departnent Lroadons Its Interpretation of Trespass, 1952 ... .« ‘ -Retention of Three Microphones "Involving | Trospass in Security Cases. . . « « © « « xiv os “<4 oOo OhW WO © Nee pw Lolo i ix! el a o oa 19 20 21