The Hollywood Reporter has this exclusive new story about how Nazi Germany and Hollywood collaborated in the 1930s. Their concern about keeping access to the German market meant that scripts were altered and even entire subjects were avoided. In this slide-show, the Reporter documents some examples of what was allowed and what was not. At slide 19, even Will Hays of the Hays Code doesn't escape mention (click there to see why).
As the slide-show explains not all movies were censored, but quite a few were. Most interesting for me was the film Gabriel Over the White House. I had never heard of it, but it basically is about a President who dismissed Congress, suspends the Constitution, declares martial law, and saves the country. He emerges a hero. Wow! The whole movie is on Youtube, and you can watch it here: