Ecstasy
It was 1933, nobody knew how to understand sexuality, and for some reason, it was the government's job to determine what was morally correct and what wasn't. The star of this film, Hedy Lamarr, was nude in one scene, and in another, the director shot a close up while she and her costar were engaging in non-contact movie sex. America lost its mind at this horrific display of immoral sexuality. In fact, Lamarr's husband attempted to get every copy of the movie destroyed multiple times.
The Song of the South
The Song of the South was one of the first live-action and animation hybrid films, but once times started to change a bit more and Disney realized that their film was tone-deaf, they decided to bury it and apologize. You see, The Song of the South perpetuated stereotypes that were absolutely racist, even for 1946. Disney missed the mark. They apologized, banned the movie themselves, and moved on.