Organizations were singled out because they included the words "tea party" or "patriot" in their applications for tax-exempt status, said Lois Lerner, who heads the IRS division that oversees tax-exempt groups.
In some cases, groups were asked for their list of donors, which violates IRS policy in most cases, she said.
"That was wrong. That was absolutely incorrect, it was insensitive and it was inappropriate. That's not how we go about selecting cases for further review," Lerner said at a conference sponsored by the American Bar Association.
"The IRS would like to apologize for that," she added.
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