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Dear Mr. Kay,
Thank you for contacting the History Hub!
The information you seek may be contained in the Records of the Bureau of Prisons (Record Group 129) for the U.S. Penitentiary at Alcatraz, California. These records are in the custody of the National Archives at San Francisco (RW-SB). Please contact them via email at firstname.lastname@example.org or call 650-238-3501.
We hope this information is helpful. Best of luck with your research!
Since you posted your question, Mr. Teller passed away. If you tried to get his record from NARA but ran into a brick wall, it was likely because of restricted some access while he was living. The records are available now for sure. My colleague has copied some of Louis Teller's files. Feel free to reach out