An American businessman alleged to have hidden nearly half a billion dollars in earnings in offshore accounts has been arrested by US authorities and charged with tax evasion, obstructing the Internal Revenue Service and fraud. It is the biggest criminal tax fraud prosecution in US history. Walter Anderson, a telecommunications entrepreneur who used the pseudonym Mark Roth, was arrested on Saturday at Washington's Dulles airport after arriving from London. He was charged with evading more than $200m in taxes over five years and faces up to 80 years in prison if found guilty. He reportedly pleaded innocent. An art collector...