The “Jews” archival series of the Historical Archive of the Secretariat of State—Section for Relations with States and International Organizations (ASRS)—is now fully available for consultation on the internet.
The series consists of 170 volumes containing requests for help addressed to Pope Pius XII by Jews, both baptized Catholics and many who were not, from all over Europe, after the beginning of the persecutions by fascist governments in the 1930s and 1940s.
You can read more in an article in the Vatican News at: https://www.vaticannews.va/en/vatican-city/news/2023-02/vatican-secretariat-state-jews-archives-fully-online.html.