The Blue Beast(1960)

Tatsuya Nakadai plays a scheming low-level executive who plays labor against management and uses anyone he can to further his career in this moral drama. When things get too hot, he bails and goes to work for a prominent politician (Koreya Senda). Soon he has impregnated the daughter (Yoko Tsukasa) of his boss, but he figures marriage will solve his current problems. His happiness is short-lived when he is stalked by a union radical he once double-crossed who now seeks vengeance.