Front running is a form of market manipulation, which on the currency markets, involves traders using insider information to play the markets and profit from institutional customers such as pension funds. It is alleged those pension funds could be losing millions of pounds as a result, which would have an impact on members of the schemes. A civil lawsuit lodged in the New York courts has been commenced against some US and UK banks including Barclays, HSBC and RBS. They declined to comment on the specific allegations raised in the US case. However, there have been questions over many banks' practices on the foreign exchange markets ever since the Libor scandal emerged at the end of 2007,

http://www.bbc.com/news/business-29316907