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by schoen 3696 days ago
Also, as people have been pointing out, "Keep calm and carry on" (on the other side of the Atlantic).

https://en.wikipedia.org/wiki/Keep_Calm_and_Carry_On

(On the other hand, there were a lot of wartime counterintelligence efforts in the U.S. and U.K. which I think must have included public calls for people to turn in suspected Axis spies.)