The film opens with the strong leadership of trade unionist, Anand Verma (Satyen Kappu), who works hard to enhance the lives of struggling laborers. He lives in a modest home with his wife, Sumitra Devi (Nirupa Roy), and their two young sons, Vijay (Amitabh Bachchan) loosely based on Haji Mastan, and Ravi (Shashi Kapoor). Anand, however, is blackmailed by a corrupt businessman who threatens to kill his family if Anand does not cease his protest activities. Forced into compliance, Anand is thus attacked by the very same laborers who then jeer him for his betrayal, unaware that he was blackmailed. His family is also persecuted by the angry workers. Out of shame, Anand leaves town, leaving Sumitra to care for their sons alone in poverty. Several of the angry workers kidnap Vijay and tattoo his arm with the Hindi words "मेरा बाप चोर है" (translated into "My Father Is A Thief"). Not knowing what else to do, Sumitra brings her children to Mumbai and struggles as a day laborer to care for her now homeless sons.Wikipedia