Communication Through the Mails.

Project Gutenberg EPUB3 edition Linebarger, Paul Myron Anthony
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Something was accomplished, however, by use of the Portuguese, Spanish, Swiss and Chinese press. Enemy officials and private persons were known to read these, and it was possible to do a great deal toward influencing editorial content.
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Major mail-propaganda operations were conducted against us, however. The Nazis, as part of their prebelligerent planning and operations, sent enormous quantities of propaganda through the United States mail—sometimes postage-free under the frank of Congressmen. The Japanese, down to the time of Pearl Harbor, kept large public-relations staffs running at full speed in New York, Washington, and other American cities. They helped their American friends with money and by heavy purchase of copyright material friendly to Japan—thus making it unnecessary for any author to report himself as a Japanese paid agent, and they offered Japanese "cultural and educational" information to interested persons. It really was cultural and well done. By talking about Japanese poetry, religion and cherry blossoms, and omitting all war propaganda, the handsome little booklets kept alive the memory of a hospitable, quaint, charming Japan. Some of this material was mailed directly from Japan to the United States.
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Since mail propaganda depends on the freedom of the mails, it is much more apt to be used by a dictatorship against us than by us against a dictatorship.

Source attribution

Psychological Warfare, Project Gutenberg eBook #48612

Standard-wave. Leaflets.