Final answer:
Warden Norton doesn't want to lose Andy Dufresne because Andy is instrumental in Norton's money laundering schemes and the financial profits they yield. Additionally, Andy's knowledge of corruption poses a threat to Norton's position.
Step-by-step explanation:
The question refers to Andy Dufresne, a character in the film adaptation of Stephen King's novella 'Rita Hayworth and Shawshank Redemption'. The character Norton likely refers to Warden Samuel Norton, an antagonist in the story. Warden Norton does not want to release Andy because Andy assists him with money laundering operations through his skills in banking and accounting. Furthermore, Andy offers Norton financial advice that significantly increases the warden's illicit gains; losing Andy would mean losing both the brains behind the operations and the financial profits they generate for Norton.
Additionally, Andy's knowledge of the corrupt activities within the prison would pose a significant threat to Norton if Andy were to be released and potentially speak out. It showcases a classic case of power dynamics and corruption within the prison system, revealing a theme central to the narrative: the exploitation of skilled individuals for personal gain.