Federal prosecutors continue to wage war on bankers who may have helped wealthy U.S. customers avoid taxes. Along with bankers at UBS and HSBC, bankers at Credit Suisse have found themselves under scrutiny.

In fact, prosecutors have just charged that four bankers at the venerable Swiss bank helped 17 clients avoid paying taxes "by setting up offshore accounts and helping conceal their transactions through credit and debit cards linked to those accounts," reports the Financial Times. "On three occasions, one banker allegedly sent bank checks to clients using a shipping company to avoid detection." 

Several offices of Credit Suisse in the U.S. have been raided.

The action against the Credit Suisse bankers follows the arrest of a UBS banker who is being moved to Florida, where several major prosecutions are underway.

At the same time, however, the IRS announced it is ending a separate high-profile effort to force UBS to disclose the names of thousands of Americans who were suspected of evading taxes by setting up various accounts abroad. About 15,000 UBS customers already turned themselves in during a voluntary disclosure period. The IRS said it will now shift its attention to other banks.

About 3,000 customers of other banks have turned themselves in, a number that will likely grow. This will make some private bankers and their customers very nervous.

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