What did the declassified documents reveal?

The document titled “23jun artur montevideo” is an internal memorandum dated twenty‑third June nineteen‑fourty, originating from an unidentified United States intelligence office. It is notable for its cryptic references to multiple operational groups and directives, and it appears in the public domain through The Black Vault archive. The memorandum was released through The Black Vault’s digital collection, hosted at archive.org. No specific FOIA case number is attached to this release, and the declassification authority is not identified in the accompanying metadata. The entry was made publicly available on the archive’s website, providing both a text transcription and a downloadable PDF for researchers. The document reads as follows: M. Ho.: VWW (of nineteen‑twelfth nineteen‑fifty‑seven) Cowr Ho. : thirty slash “Aaror to oo to mhovxbo to bzvcrt cm his AJO ASSISTANT “ALBCSAHEM” (nineteen‑M.) wacw one twenty‑threerd June nineteen‑fourty A In nineteen‑W w. noot to AMBTIHA for Illegal -or our Cl group uarecov.rd) usuMr tM or “AxTWTiJ (fifteen group. vmrocovtrolj •lth« through rarim or In writing. Taking Into account the danger of euoh ““ Jf ®«>~leU0B t • cm “AKW lnetruotlcoa to ewe to your country •od, after faarlac act you, to giro n full report covering the -hoi. period of hie -or. Admitting the poeeiblllty of “AMVB’e” being ehndoued [two croupe unrecoverable] during eeetln«B aalntaln eecurlty and If according to the ccodltlwe [A group, uarecov.red) “AKW -haul euhnit to ue eredJ “AHWJT ahould eubait to ue [thirteen group. uarecovered) t- one . Do hi work? - two - three /KHM ?.9 •allaMd for Um work CJ5 group unrecoverable] •alit the of local Anglo‑American organisation. for three. six . ro Wht cover t u of BQ tb. -tool. tla7 AHVB” poae.ee r.d bo roliahle one It? b a OT t hi dipo seventeen How such [four group, unr.cover.dj seven . What hi bNB doa la our worfc by hi asaiataat “AIJICSANrS”[li] la CHILE? . • Vbt r hi plan and euggeatloo for tb futur. aapeclally la Cl6 group unrecovered] la t In- A m rt can country but alao Cifl gr<ip uarcov.rd] fcnklrUl fn you a report <o hi work, w will give int ruction about “APTVB’a” rutur# voile. [« groups uarocov.rabl.] CAL

Why was this case declassified?

This material was released by the National Security Agency (NSA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked on this page so the citation chain is auditable.

23jun Artur Montevideo

Q: Why was this case declassified?

This material was released by the National Security Agency (NSA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked on this page so the citation chain is auditable.

◆ BLUF — The short version

The document titled “23jun artur montevideo” is an internal memorandum dated twenty‑third June nineteen‑fourty, originating from an unidentified United States intelligence office. It is notable for its cryptic references to multiple operational groups and directives, and it appears in the public domain through The Black Vault archive.

Agency: National Security Agency (NSA)
Date: JUL 18 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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Questions about this case

What was 23jun Artur Montevideo about?: The document titled “23jun artur montevideo” is an internal memorandum dated twenty‑third June nineteen‑fourty, originating from an unidentified United States intelligence office. It is notable for its cryptic references to multiple operational groups and directives, and it appears in the public domain through The Black Vault archive.
Why was this case declassified?: This material was released by the National Security Agency (NSA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked in the case notes above so the citation chain is fully auditable.

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