Dear Mr. Rettie,
Thank you for posting your request on History Hub!
We suggest reviewing the records of the Special War Problems Division located in the General Records of the Department of State (Record Group 59), especially the following series: “Transcripts of Proceedings Before the Hearing Board of the Alien Enemy Control Section, 2/1946-3/1946,” “Name Files of Interned Enemy Aliens from Latin America, 1942-1948,” “Name Files of Enemy Aliens, 1942-1948,” and “Reports on Interned Enemy Aliens, 1942-1947.” Also, checking the “Name Index, 1910-1973” to the “Central Decimal Files, 1910-1963” might be helpful for your research.
In addition, we suggest checking the “Intelligence and Investigative Dossiers Impersonal Files” and “Intelligence and Investigative Dossiers Personal Files” in the Records of the Records of the Army Staff (Record Group 319) as they may contain information relevant to your research.
These records may be viewed at the National Archives at College Park, MD. The staff of the National Archives at College Park - Textual Reference (RDT2) will be pleased to make the finding aids to these records available to you or your representative in the Textual Research Room located 8601 Adelphi Road, College Park, MD, near the University of Maryland--College Park campus. The Textual Research Room (Room 2000) hours are 8:45 a.m. to 5:45 p.m., Monday through Friday, except legal holidays. The RDT2 consultation room hours are 8:45 a.m. to 4:00 p.m., Monday through Friday, except legal holidays. No appointment is necessary. Prior to your visit, please consult College Park websites at https://www.archives.gov/dc-metro/college-park/, https://www.archives.gov/dc-metro/self-service-copying.html, and https://www.archives.gov/research/start/getting-started.pdf.
Also, we suggest that you review CREST (CIA Records Search Tool) at https://www.foia.cia.gov/search/. Information concerning CREST is provided on the CIA web site at https://www.foia.cia.gov/collection/crest-25-year-program-archive and contains millions of pages of records released in electronic format.
We hope this information is helpful. Best of luck with your research!