I don't exactly know what the Nazi threat was after the first 10 minutes of Raiders. That's not the best example, because the Nazi threat and how that threat would never be a threat were all wrapped up in the really cool McGuffin that pervaded the movie.
I guess a better example is the Nazis in The Last Crusade. They were a threat because they continued to harass and threaten our heroes, not because they were going to invade Poland, or even because Adolph Hitler might become immortal.
The Russians in Indy 4 were less threatening, but they were still Indy's adversaries. I don't think it was any more necessary for them to be spreading communism along the Amazon than it was for the Nazis in Last Crusade to fill the armoured Tank with deadly gas once Brody and Professer Jones were captively onboard.
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