Here are details on the four major scandals in banking, telecoms, housing and sports:
Loan Bribery Case
Top officials of Indian banks, lenders and financial firms have been accused of taking bribes to grant corporate loans. While the size of the scandal is not known, it would have to be considerably larger than the alleged bribes paid.
The Central Bureau of Investigation (CBI), India's federal investigative agency, arrested on Wednesday eight people, including the chief executive of LIC Housing Finance and senior officials at state-run Central Bank of India, Punjab National Bank and Bank of India.
The bribes were allegedly paid by private finance firm Money Matters Financial Services, which acted as a "mediator and facilitator" for the loan beneficiaries, the CBI said.
Three Money Matters executives, including the managing director, have been arrested for offering bribes.
Government investigators did not say who the beneficiaries were. Local media said Money Matters' clients included Suzlon Energy, developers DB Realty and Lavasa, a unit of Hindustan Construction.
Companies whose officials have been arrested as well as those named in the local media have all denied any wrongdoing.
Government officials, including ministers, have said this is a case of individual wrongdoing and not a widespread scam.