Dharmatma(1975)

Wealthy, powerful and influential Seth Dharamdas is known to come to the aid of all people who are poor, and this leads to him being known as Dharmatma. However, he also has a parallel life as a gangster. The only person Dharamdas hates and fears is none other than his very own son, Ranbir, who has sworn that he will never compromise with his father's dark career, and threatens to expose him.