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I don't have a subscription to newspapers.com I can see snips of articles without one
You can get a free trial if you have never had a subscription before.
Here is the snip that I saw, if this is him you might be able to get more information from the article.
Good Luck in your search
Dear Ms. Ingram,
Thank you for posting your request on History Hub!
If he committed a federal crime and was imprisoned in a federal facility, the National Archives may have a record of him. Please note that not all inmate case files were retained as permanent records. Those inmate files that were retained are located in the National Archives regional facility that has custody of the regional federal records for that state. To request a search files concerning inmates of federal penitentiaries located in the State of California, please email the National Archives at Riverside (RW-RS) at firstname.lastname@example.org and the National Archives at San Francisco (RW-SB) at email@example.com.
Please note that being a California resident or being arrested in California on a federal crime would not necessarily mean that he was imprisoned in a federal penitentiary located in California. If you do not know where the person you are researching was incarcerated, you may contact the National Archives at Kansas City, MO (RM-KC) that has a copy of the Bureau of Prisons microfilm publication entitled "Index to Released Federal Prisoners, 1911-1974." Their email address is firstname.lastname@example.org.
Recent records of federal inmates still may be in the custody of the Federal Bureau of Prisons.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RW-RS, RW-SB, and RM-KC. We apologize for this inconvenience and appreciate your understanding and patience.
The National Archives does not have records of persons arrested and incarcerated by county, city, or state authorities. If you are referencing the arrest described in the articles “Caught in the Act, He Throws Back Stolen Money”, Ventura County Star-Free Press Ventura, California 03 Mar 1964, and “Bail Set for Trio in Till Tap Case” Ventura County Star-Free Press Ventura, California 04 Mar 1964, then the case involved a violation of state law and was handled by state and local authorities. There would be no federal records of the case. In this case, we suggest contacting the Superior Court of California, Ventura County to inquire about the disposition of records concerning this case. We also suggest contacting the California State Archives for information regarding the disposition and availability of California state inmate case files.
We hope this information is helpful. Best of luck with your family research!