UBS Group AG stood trial in Paris accused of harassing a pair of whistleblowers who lifted the lid on the bank’s efforts to help wealthy French dodge taxes.

In a saga that’s dragged on for more than 15 years, a French unit of the Swiss lender is accused of sidelining and slashing the bonus of former auditor Nicolas Forissier, who was penning a report that pointed to potentially unlawful behavior.

Nicolas Forissier

Photographer: Joel Saget/AFP/Getty Images

It’s also accused of penalizing Stéphanie Gibaud, who helped authorities spy on clients at an event organized around the 2011 Roland-Garros tennis tournament.

As the trial opened on Tuesday, ...

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