Credit Suisse whistleblowers say Swiss bank has been helping wealthy Americans dodge U.S. taxes for years

Credit Suisse, the collapsed Swiss bank taken over by UBS Group in a hastily arranged bailout earlier this month, may bring with it a fresh set of regulatory and legal problems for its new owner.

For years, the bank has provided a safe haven for wealthy American clients to hide assets from the IRS — even after it was caught and prosecuted for doing the same thing more than a decade ago, according two former Credit Suisse bankers who spoke in exclusive interviews with CNBC and are working with the U.S. government...