Sarkari Mehman (1979)

Police Sub-Inspector Anand is known for his honesty, diligence, and bravery. He single-handedly captures and arrests notorious smuggler and gangster Jack and has him sentenced to several years in prison. Using plainclothes and a disguise as a Nawab, he entraps another notorious hoodlum, Gul Khan, and has him arrested and sentenced to a long prison term. Although things go well with Anand at his workplace, things are not all that hunky-dory at home, as his wife Rekha, who comes from a wealthy family, is unhappy about her new lower status in society and in the community, resulting in frequent arguments, with Anand threatening to kill her on several occasions. Then Anand comes to know about her having an affair with Somesh and follow her, hoping to catch them red-handed. Shortly after that, Rekha and Somesh are found dead and Anand is arrested for their murders. He is tried in court and sentenced to prison for life. Anand knows that he didn't kill them and decides to prove his innocence by escaping from prison and catching the real killer(s). Before he can even plan his escape, he comes face-to-face with his foes--Jack and the seemingly-invincible Gul Khan--who will kill him in a heartbeat.