You are not mistaken. The US government did not want admirers of Hitler to have any way of focusing their love of Hitler on anything, and I do mean ANYTHING relating to Hitler.
Hope that sentence made sense.
Our shrinks did a good job, actually, of profiling him.
A book was written in Germany in the 1990s that was a psychological profile of Hitler. Although it was eventually allowed to be published, the German government initially forbade its being printed. The fear was that to understand all was to forgive all. They still smart from Nazism.