From 1943, here is a Department of War film about resisting the Nazi Party. (Just gonna ignore the fact that, 74 years and a literal world war later, this is relevant again.)  The Atlantic has more on how this video resurfaced and spread.

From the narration:

“[The Nazis] knew they were not strong enough to conquer a unified country. So they split Germany into small groups. They used prejudice as a practical weapon to cripple the nation. […] We humans are not born with prejudices. They are made for us–made by someone who wants something. Remember that when you hear this kind of talk. Somebody’s going to get something out of it. And it isn’t going to be you.”