Do Thug (1975)
It is the story of two things (cheaters), Ravi (shatrughan Sinha) & bijli (Hema Malini). They start up with small cases like pick pocketing etc. and end up with big smugglings for ranjeet (Ajit). Ranjeet kills madan seth (satrughan sinha in double roll) and entraps ravi in the murder case. He blackmails ravi for his business. Ranjeet is also the killer of brigadier ram father of bijli.