Chamber of Commerce Accused of Tax Fraud

By ERIC LICHTBLAU

WASHINGTON — With a war chest rivaling that of the Republican Party itself, the U.S. Chamber of Commerce has emerged in the last year as perhaps the Obama administration’s most-well-financed rival on signature policy debates like health care and financial regulation.

Critics on the left have long complained about the chamber’s outsize influence. But now they are taking on the business association directly, charging in a complaint filed Friday with the Internal Revenue Service that it violated tax codes by laundering millions of dollars meant for charitable work from a group with ties to the insurance giant A.I.G.

The complaint was brought by a group called U.S. Chamber Watch, which was created four months ago — with the strong financial backing of labor unions — to scrutinize the Chamber of Commerce’s growing influence and provide a counterbalance.