The financial sector is also heavily involved in the drug trade. For example, HSBC (Hong Kong and Shanghai Banking Corporation) started off by laundering money for the opium trade of the East India Trading Company & has recently been caught laundering drug money. A number of other historical figures & powerful families were also involved.

http://greatgameindia.com/hsbc-bank/

https://www.reuters.com/article/us-hsbc-probe-idUSBRE8BA05M2...