There was much discussion in the 1950s about "brainwashing" practiced on American POW's by the Chinese and North Koreans during the [[Korean War]]. Scholars have concluded there was no such brainwashing but it was a real fear at the time. The film picks up and elaborates on this fear.
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A key premise of the movie was that it was possible to [[brainwash]] an unsuspecting prisoner into committing [[murder]]:
A key premise of the movie was that it was possible to [[brainwash]] an unsuspecting prisoner into committing [[murder]]: