Harshad Mehta was a stockbroker who exploited loopholes in India's banking system in the early 1990s to manipulate stock prices and defraud banks of Rs. 4,000 crore. By using instruments like ready forward deals and fake bank receipts, Mehta was able to drive up prices of various stocks tremendously before the scam was exposed by a journalist in 1992. The scam had widespread impacts, including losses for banks, regulatory changes by the RBI, and investigations and arrests of individuals involved, including Mehta himself who died in prison in 2001 under mysterious circumstances.