It’s one of those things where we don’t really want to look anymore – but we cannot help ourselves. As the Swiss bank suffers another wave of defections at its wealth-management unit, a court filing surfaces indicating former UBS executive Bradley Birkenfeld has now decided to cooperate with the Justice Department and plead guilty to tax fraud. And, as if that wasn’t painful enough, he’s also expected to reveal the names of his U.S. clients. A look at what’s at stake when he appears in federal court on June 9.

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