</s>180-1010-1010121 2025 RELEASE UNDER THE PRESIDENT JOHN F. KENNEDY ASSASSINATION RECORDS ACT OF 1992 JFK Assassination System Date: 10/21/20 Identification Form Agency Information AGENCY: HSCA RECORD NUMBER: 180-110-10110-10121 AGENCY : HSCA SECURITY CLASSIFIED FILES RECORD SERIES : RECORDS : SECURITYCLASSIFIED FILES AGENCY FILE NUMBER : 151-JFK 151-JFK AGENCY FILENUMBER : HSCA Document Information ORIGINATOR : FROM: HSCa TO: Document Information TITLE: DATE : PAGES : 7 06/02/1978 SUBJECTS: OSWALD, LEE, POST-RUSSIAN PERIOD, TRAVEL, TRIP TO MEXICO CIA DOCUMENT TYPE: SUMMARY CLASSIFICATION : Unclassified RESTRICTIONS : 1B CURRENT STATUS : Redect DATE OF LAST REVIEW : 08/07/1997 OPENING CRITERIA : COMMENTS : Box 5. 1 v1 NW 50955 DocId: 32263526 Page 1

Summary  
This document details an interview with Arnold Arehart conducted by the House Select Committee on Assassinations (HSCA) in 1978. Arehart, a former CIA technician stationed in Mexico City, described his role in monitoring telephone taps at a covert listening post operated by the CIA and Mexican intelligence. The base monitored 30 incoming phone lines, with corresponding tape machines recording conversations. Tapes were categorized into Cuban-related, Soviet-related, and other (e.g., Mexican radicals/politicians). Cuban tapes were stored for 30 days before reuse, while Soviet tapes were routinely delivered to Anne Goodpasture or Boris Tarasoff. Arehart noted that summaries of important conversations were prepared by Mexican monitors and sent to Goodpasture, though he had no knowledge of their ultimate disposition. He confirmed no tape containing Lee Harvey Oswald’s voice was ever requested or retained. The equipment used included Ampex 701 recorders, and transcripts of intercepted calls (in Spanish) were produced at the base. Arehart stated he had never discussed these operations with CIA personnel or the HSCA prior to this interview.  

Key People  
- Arnold Arehart: Former CIA technician in Mexico City; described his role in monitoring phone taps and managing recording equipment.  
- Anne Goodpasture: Identified as a contact for transmitting summaries and transcripts; referred to as a case officer.  
- Win Scott: Mentioned as a liaison with whom Arehart communicated via telephone.  
- Boris Tarasoff: Soviet translator who received Russian tapes for transcription.  

Key Locations  
- Mexico City: Site of the CIA listening post and U.S. Embassy.  
- Listening Post Base: Located near the U.S. Embassy; housed recording equipment and monitoring operations.  

Key Events  
- Operation to monitor Cuban, Soviet, and Mexican phone lines via covert tapping.  
- Routine delivery of tapes and summaries to Goodpasture or Tarasoff for transcription.  
- Storage and reuse protocols for Cuban tapes (30-day retention) versus Soviet tapes (routine removal).  
- No confirmed evidence of Oswald’s voice on any tape; no record of tapes being retained post-retirement.  

Key Organizations  
- House Select Committee on Assassinations (HSCA): Conducted the 1978 interview with Arehart.  
- Central Intelligence Agency (CIA): Operated the listening post in Mexico City under deep cover.  
- Mexican Intelligence: Collaborated with CIA via a counterpart named "fnu Coseo" and his father, a senior Mexican official.

JFK Declassified Files

180-10110-10121.pdf

Document Summary

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