Most people now-a-days thinks that propaganda is all about peddling lies, and that if it is true (or people believe it is true), that they aren’t being propagandized against. In reality, propaganda is about shaping perceptions of reality, even when it comes to perception of truth.
This old educational film from early in the Cold War demonstrates how subtle, and effective, propaganda techniques can be.
One can use this knowledge to be a bit more critical of what others are trying to convince you of… and use it yourself to great effect.
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