Black River
Perhaps Masaki Kobayashi's most sordid film, BLACK RIVER examines the rampant corruption on and around U.S. military bases in Japan following World War II. Kobayashi spirals out from the story of a love triangle that develops between a good-natured student, his innocent girlfriend, and a coldhearted petty criminal (Tatsuya Nakadai, in his first major role) to reveal a nation slowly succumbing to lawlessness and violence.
Starring Fumio Watanabe, Ineko Arima, Tatsuya Nakadai, Asao Sano, Seiji Miyaguchi, Eijirō Tōno, Isuzu Yamada, Tomo'o Nagai, Keiko Awaji, Natsuko Kahara
Watch "Black River" on Criterion Channel released in 1957. It's a drama and crime movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.