Inspired by the troubles of Bombay’s textile mills in the early 1970s, and based loosely on the classic 1964 film Becket, starring Peter O’Toole and Richard Burton, Namak Haraam was directed by Hrishikesh Mukherjee and was the first mainstream Hindi film to feature trade union politics as a central theme. A carefree young man Vicky (Amitabh Bachchan), who also happens to be the son of a rich businessman (Om Shivpuri), is forced to temporarily run his father’s business. Vicky would rather spend his time with Somu (Rajesh Khanna), his friend who comes from a humble background, than attend to matters of business. One day, the hot-headed Vicky has a confrontation with Bipinlal (A.K. Hangal), the trade union leader of his father’s mill, and feels insulted when his father makes him apologize to the lowly workers’ leader. When Somu learns of Vicky’s insult, the two hatch a plan wherein Somu would infiltrate the union pretending to be a worker and make life hell for Bipinlal. Things go according to plan initially, but the more time Somu spends with the workers, the more he realizes their hardships. Somu is transformed and becomes the union’s poster boy—another Bipinlal for Vicky, who can’t get over his friend’s betrayal. When Vicky’s father finds out the truth, he sets in motion a chain of events that makes Somu and Vicky sworn enemies.