104-10335-10001: Memo from AARB Executive Director to CIA Historical Group Director, May 30, 1995: https://www.archives.gov/files/research/jfk/releases/104-10335-10001.pdf
This document was sent by Assassinations Records and Review Board Executive Director David Harwell to the Director of the CIA Historical Review Group John Pereira. It offers a list of Agency cryptonyms and pseudonyms and requests officials to provide the corresponding true names or a general description of the type intelligence relationship the related person, group, or location had with official projects. The document states that STGANG is a Chinese Communist audio operation.
The cable is a request from CIA officials to send thirty dozen tapes by air pouch for surveillance operations that included Soviet, Cuban, and STGANG (Chinese) operations.
The Agency Chronology lists the prior mentioned cable (104-10413-10288) requesting additional tapes originated from Mexico City Station. This would infer the Chinese Embassy or its officials were under similar surveillance targeting the Soviet and Cuban Embassies and this inspired the request.