Cryptonym: PBCHORD
https://www.archives.gov/files/iwg/declassified-records/rg-263-cia-records/second-release-lexicon.pdf
CIA document: Research Aid: Cryptonyms and Terms in Declassified CIA Files Nazi War Crimes and Japanese Imperial Government Records Disclosure Acts: Page 44: ..."Term: PBBCHORD. Definition: Cryptonym for the American Committee for the Liberation of the Peoples of Russia (AMCOMLIB), which is a part of Project QKACTIVE..."
104-10112-10113: CLASSIFIED MESSAGE.
05/18/60: Cable from Director to Munich and Frankfurt (Orig: A. F. Reynolds, IO/1): Slugline DTDORIC TPFEELING FOR BARMESTER: "Joe Scott advises State has reviewed amended draft letter submitted by Munich CONGEN, feels no letter in any form should be sent by consulate to exiles as proposed. Basis turned down that sending letter exceeds original letter authority ambassador and sets undesirable precedent. We plan further discussions here but feel any change above State position unlikely. Will discuss with Alexander 19 May but request you also inform TPFEELING asking whether alternative device (such as FEC letter as first proposed) acceptable TPFEELING and exiles. Advise. C/S Comment: *Barmester and Greenlee met with Hamish and Belenko after review copies PBCHORD's correspondence with Hoffman." Releasing Officer: C/EE. Coordinating Officers: OGC Pagan - by phone. OS/AAS Pennington - by phone. Authenticating Officer: Cord Meyer, Jr., Chief.
01/28/63: Dispatch from COS, Paris to Chief, Munich Operations Group: Subject: CAMOG/Unintelligible/QKACTIVE - PBCHORD Use of UNRUMBLE/2: "1. On 16 January 1963, the undersigned discussed the PBCHORD use of UNRUMBLE/2 (Pedro Ruiz Quintero, a Cuban medical student living in Paris) as noted in the above reference, with Henry N. Langdon from the Munich Base transiting Paris. 2. The Station pointed out that it has no objections to the use of UNRUMBLE/2 as outlined in the above reference. Langdon was briefed, however, of the inherent security dangers in view of the fact that the local French services have attempted to approach UNRUMBLE/2 for possible PBRUMEN (Cuba) activities. Arrangements for continued (unintelligible) contact with UNRUMBLE/2 from Munich has been arranged and given to Langdon. Robert B. (Unintelligible)."