</s>204-1046-10139 2025 RELEASE UNDER THE PRESIDENT JOHN F. KENNEDY ASSASSINATION RECORDS ACT OF 1992 SECRET DOHB 70-1-1 CHAPTER III 15 November 1974 ANNEX B ANNEX B THE 201 SYSTEM Recision: Annex B of Chapter III, CSHB 70-11, 27 October 1966 1. INTRODUCTION The 201 system provides a method for identifying a person of specific in- terest to the Operations Directorate for controlling and filling all pertinent information about this person. The system also provides a means for identifying subjects of 201 files from various categories of information about them and for information about that person. Also includes a series of rules and guidelines for identifying tively small files from individuals interested in sufficient interest to justify information about the system also included in the following statements. CI investigation, prospective agents and sources, members of groups and organizations, tions of continuing target agents, or subjects of whom a volume of corre- spendence has accumulated. 2. THE 501 SYSTEM: The principal features of the 201 system are: The 201 Number: a unique file number, ie, 201-1234567, assigned to each individual in the system to serve as identifying file number for reporting on that individual in this system to ensure that the official file contains the 201 opening form (Form 831) and all biographical reporting on references to the individual, ie ., per- sonal history, current status, and prospects. a. The 201 System: The official file containing the 201 Opening form (form a. A. The Master Data Record, a machine record generated by the opening of a. the Master Data: a machine reference for the Main Index and stores the pertinent information which may may be retired for special listings. d. Main Index Master 201 Reference: printed in reply to an Intex Search Request is printed as illustrated below. When data is absent within the record, it is printed in illustrated below, printed as indicated data and absent errento considered. 23 SECRET

Summary  
The text outlines procedural guidelines for managing classified personnel records within clandestine services, emphasizing the use of 201 numbers and IDN (Intelligence Data Number) codes to track individuals of operational interest. It details criteria for standard and non-standard listings, including factors such as country of location, O1/O2 codes, occupation, and birth details. The document specifies that 20,1 numbers are assigned by headquarters or field dispatches and are used to organize records in the CS (Clandestine Services) system. IDN numbers, which are not file numbers, are used for tracking individuals of tangential interest and are integrated into listings with the identifier "P" in the "Type of Name" column. Procedures for updating field stations on new 201 openings and IDN assignments via the Field Index Card Service are described. The text references specific intelligence agencies (e.g., MI-5, MI-6, DSE, DGII) and countries (Egypt, USSR, North Vietnam, Cuba) as examples of entities covered under these protocols.  

Key People  
- Individuals assigned O1/O2 codes or IDN numbers (specific names not provided).  
- Members of intelligence agencies (e.g., MI-5, MI-6, DSE, DGII, Canadian Communist Party officials).  

Key Locations  
- Egypt (ARE), USSR, North Vietnam, Cuba.  
- United States and Mexico (as locations for individuals with O1 codes).  

Key Events  
- Assignment of 201 numbers to personnel of operational interest.  
- Creation of non-standard listings based on occupation or other criteria.  
- Procedures for updating field stations on new records via the Field Index Card Service.  

Key Organizations  
- Clandestine Services (CS) headquarters and field stations.  
- British Intelligence Services (MI-5, MI-6).  
- Canadian Communist Party and its front organizations.  
- Israeli intelligence services (GNE/ISST).

JFK Declassified Files

104-10406-10139.pdf

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