Harry Truman actually said...

All citizens of the United States who may have knowledge of or access to classified security information are requested to observe the standards established in such regulations with respect to such information and to join with the Federal Government in a concerted and continuing effort to prevent disclosure of such information to persons who are inimical to the interests of the United States.

Context

Executive Order 10290—Prescribing Regulations Establishing Minimum Standards for the Classification, Transmission, and...

09/23/1951

https://www.presidency.ucsb.edu...

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