Indian black money refers to undisclosed funds and income earned through illegal means that have not been taxed. Estimates suggest over Rs. 7,280,000 crores of Indian money is deposited in foreign banks, especially Swiss banks. While exact numbers are unknown, Swiss banking officials say Indians are among the largest depositors of illegal foreign money in Switzerland. In 2010, India revised tax agreements with Switzerland to facilitate investigations into black money held in Swiss accounts. A whistleblower provided Wikileaks with a list of famous Indians alleged to have stashed money from activities like mining, stock market manipulation, and drug dealing in Swiss banks since the 1970s.