The Round Up (movie, 2010)

Joseph is eleven. And this June morning, he must go to school, a yellow star sown on his chest. He receives the support of a goods dealer. The mockery of a baker. Between kindness and contempt, Jo, his Jewish friends, their families, learn of life in an occupied Paris, on the Butte Montmartre, where they've taken shelter. At least that's what they think, until that morning on July 16th 1942, when their fragile happiness is toppled over.