An informant--a former LGT employee--reportedly sold the information to Germany's intelligence service in 2006.

FORBES: Magazine Article

German officials are working from a list of about 1, 400 clients of Lichtenstein financial institution LGT Group.

FORBES: Magazine Article

Representatives of UBS and LGT, as well as IRS Commissioner Douglas Shulman, are expected to testify at the hearing Thursday.

FORBES: Tax Havens Under Attack By Congress

Clients of banks other than UBS and LGT shouldn't get too smug.

FORBES: End of an Era?

The report lists seven specific cases involving U.S. clients of LGT.

FORBES: Tax Havens Under Attack By Congress

The report also takes aim at Liechtenstein's LGT Group, charging that the bank's practices contributed to a "culture of secrecy and deception" that encouraged tax evasion among some of its U.S. clients.

FORBES: Tax Havens Under Attack By Congress

But its reputation is under pressure from a massive German-led tax investigation into 1, 400 people who kept their money in Liechtenstein bank LGT Group, usually in the form of foundations, to help them evade paying tax at home.

FORBES: Tax Evaders, Beware The Liechten-sting

In February, it came to light that an informant sold German officials the names of 1, 400 LGT clients when a tax sweep in Germany resulted in the arrest of a prominent executive for tax evasion. (See "The Robin Hood Of Taxes") The United States, the United Kingdom, Australia, Italy and several other countries soon joined the investigation.

FORBES: Tax Havens Under Attack By Congress