Jean Gabin is quickly becoming one of our favorite actors just because we see him so much that we've gotten a crash course in him. He may be among the top five most featured actors in the collection, certainly after Akira Kurosawa's regulars Takashi Shimura and Toshiro Mifune -- maybe someone in Wes Anderson's troupe comes close to him? Ultimately, Gabin was the face of French Poetic Realism and the earliest examples of that genre's offspring Film Noir.
Marcel Carne's Port of Shadows is a bridge between the two genres. Released in 1938, it's among the first films that critics at the time referred to as Film Noir, and it certainly hits a lot of the notes we expect from the genre while still being a firm example of Poetic Realism.