US prosecutors have charged Texas billionaire Robert Brockman with a US$2 billion ($3b) tax fraud scheme in what they say is the largest such case against an American. Department of Justice officials said at a news conference that Brockman, 79, hid capital gains income over 20 years through a web of offshore entities in Bermuda and Nevis and secret bank accounts in Bermuda and Switzerland. Prosecutors announced that the CEO of a private equity firm that aided in the schemes would cooperate with the investigation. The 39-count indictment unsealed on Thursday (Friday NZT) charges Brockman, the chief executive officer ... (full story)