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Displaced Persons records have been found, sometimes, among the Civilian Personnel Records at the National Archives in St. Louis. This would occur if they were employed at the Displaced Persons camp by the Department of the Army/Air Force or Labor Service. We also have the Official Personnel Folders of the Displaced Persons Commission (DPC), however this does not imply that it includes those forced laborers. The goal of the DPC was to eventually repatriate if possible, and therefore records on individuals and their “employment” were rarely kept.
There are also records of the Displaced Persons Commission kept in Washington. A description of them can be found at; https://www.archives.gov/research/guide-fed-records/groups/278.html and https://www.archives.gov/research/military/ww2/refugees.html#iro .
Here is a great article from the US Army's Special Operations Publication, Veritas:
Here are two previous, History Hub discussions on the same topic with some interesting options for your research:
If you wish to obtain any records which might exist within the Civilian Personnel Records, you may do so by reaching out to our St. Louis Office.
I hope this is helpful in your research!