LETTER: ARRB REQUEST NO. CIA-10, FOR INFORMATION
Agency: CIA
Originator: CIA
From: MS. LAURA DENK, ESQ
To: J. BARRY HARRELSON
Document date: 08/13/1998
Document type: PAPER - TEXTUAL DOCUMENT

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JFK ASSASSINATION SYSTEM

IDENTIFICATION FORM

AGENCY INFORMATION

AGENCY

RECORD NUMBER

RECORD SERIES

AGENCY FILE NUMBER

: CIA

104-10330-10125

JFK

PROJFILES -CORRESPONDENCE

DOCUMENT INFORMATION

Released under the John

F. Kennedy

Assassination Records

Collection Act of 1992

144 USC 2107 Notel.

Case#:NW 53217 Date:

06-22-2017

AGENCY ORIGINATOR

FROM

TO

TITLE

DATE

PAGES

CIA

J. BARRY HARRELSON

MS. LAURA DENK, ESQ

LETTER: ARRB REQUEST NO. CIA-10, FOR INFORMATION

08/13/1998

1

SUBJECTS

: JFK ASSASSINATION

JFK DOCUMENT

DOCUMENT TYPE

PAPER

CLASSIFICATION

RESTRICTIONS

CONFIDENTIAL

CURRENT STATUS : 1A 1B

RELEASED IN PART PUBLIC - RELEASED WITH DELETIONS

DATE OF LAST REVIEW

: 06/15/96

COMMENTS :

JFK-M-15: F5:

2000.02.08.07:21:41:763035

[R]

------=.

- ITEM IS RESTRICTED

104-10330-10125

HH 53217

DocId: 32404110

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CONFIDENTIAL

13 August 1998

Ms. Laura Denk, Esq.

Executive Director

Assassination records Review Board

600 E Street, N.W.

2nd Floor

Washington, D.C.

20530

Dear Ms. Denk:

(C) Re: ARRB Request No. CIA-10, for Information

on the Interagency Source Register (ISR)

(U) The following is responsive to referent request.

(C) The ISR is simply a device whereby agencies within

the intelligence community which recruit or deal with

sources of foreign positive intelligence outside the United

States try to keep from bumping into each other in the

pursuit of such information.

It is for the further purpose

of ensuring a source cannot gain an unwarranted advantage by

dealing with more than one agency.

Each agency is

responsible for registering an individual as a source with

the ISR before using the individual.

(C) The ISR was established in 1957 by the Intelligence

Advisory Committee, predecessor to the U.S. Intelligence

Board. The ISR was

1958-1965

and

not used extensively during the years

we know of no system or procedure which took

its place.

(C) The first ISR regulations were in the form of basic

procedures each agency was to follow, procedures which have

gone through a number of reiterations.

ARRB staff members

have reviewed the classified, current written instruction

governing the existence and use of the ISR.

(U). I believe that this information is fully responsive

to your request on the ISR and accordingly, completes our

work on CIA-10.

Sincerely,

J. Barry Harrelson

CL BY :

0611637

CL REASON: 1.5(c)

DECL:

X1

DRV FROM: Per 10-82

CONFIDENSIAL

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