Former UBS superstar Bradley Birkenfeld will arguably go down as one of Switzerland’s most notorious private bankers.

It was he who blew the whistle on UBS’s cultivation of American clients seeking to shelter their wealth offshore, far from the purview of the IRS.

To most people in Switzerland, Birkenfeld is a traitor; to others, he became a saviour in the way he put a bombshell under the Swiss role as the natural home of tax evaders worldwide.

Starting some f...