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SOLVEDSOLVEDSOLVED I was looking at American WWII propaganda films, and clicked on a link for another movie of that time period dealing with the Black Dragon Society, and found it on Wikipedia. It was "Let's Get Tough!", an East Side Kids movie. Thank you all of you who were hoping that I would get the name. Have a great day! :)
I haven't actually seen the show myself, but I saw the tvtropes page for it. It takes place in WWII and an American city and involves a Japanese-American who used to be a friend of the adult female character, but now the Japanese-American is working for Imperial Japan, and one of the kids' brother was dishonorably discharged, but that was really a cover story for him to go back home and bust the plot. The group of kids also do something to a shop (I think that it was vandalism) and the friendly police officer tells them that it was bad because the man wasn't Japanese, but Chinese. They then get flowers and apologize to the wife of the man. Could anyone help me please find it?