Speaking of Suckers ...
I've mentioned this film before; unfortunately, the link I used is dead. Fortunately, it's back. The title is Don't Be a Sucker. It was made by the War Department in 1947, and it's about as subtle as a jackboot in the face. It starts out like one of those embarrassingly awful "avoid card sharks and attractive women in bars" films, and morphs ...
It's still the best film on what we now call "diversity" I've ever seen. Go watch; it's about 17.5 minutes long.