UBS whistleblower Birkenfeld sues bank for libel

NEW YORK, May 1 (Reuters) - A former UBS Group AG banker who as a whistleblower helped U.S. authorities prosecute the Swiss bank for tax fraud, only to spend 2-1/2 years in prison for helping a billionaire client evade taxes, on Monday filed a $20 million libel lawsuit against his former employer.

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