If an individual falsifies his or her tax claim by concealing their income in offshore accounts, banking secrecy laws in countries like Switzerland have in the past helped to keep that income hidden by making it a crime for the banks and their employees to disclose information about clients.

FORBES

There are enough grey areas in the historical record - not to mention events hidden behind official secrecy rules - to keep historians arguing for centuries about how precisely the Cold War was won.

BBC: Why London is getting a statue of Ronald Reagan