I seriously doubt that. The Office of Censorship was regularly opening private mail from USPS and purposefully destroying private mail that was unsavory to the war effort.
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Historically, the practice of postal censorship extended back to the Civil War: with both Confederates and Union governments censoring the mail within their control.
Bigger than the Office of Censorship, deployed during WW2 to help propaganda efforts? (https://en.wikipedia.org/wiki/Office_of_Censorship)
I seriously doubt that. The Office of Censorship was regularly opening private mail from USPS and purposefully destroying private mail that was unsavory to the war effort.
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Historically, the practice of postal censorship extended back to the Civil War: with both Confederates and Union governments censoring the mail within their control.