Top Corporations Aid U.S. Chamber of Commerce Campaign
delivered $1.7 million to the chamber last year as the group took a leading role in aggressively fighting proposed rules that would impose tighter security requirements on chemical facilities.

And Goldman Sachs, Chevron Texaco, and Aegon, a multinational insurance company based in the Netherlands, donated more than $8 million in recent years to a chamber foundation that has been critical of growing federal regulation and spending. These large donations — none of which were publicly disclosed by the chamber, a tax-exempt group that keeps its donors secret, as it is allowed by law — offer a glimpse of the chamber’s money-raising efforts, which it has ramped up recently in an orchestrated campaign to become one of the most well-financed critics of the Obama administration and an influential player in this fall’s Congressional elections.

They suggest that the recent allegations from President Obama and others that foreign money has ended up in the chamber’s coffers miss a larger point: The chamber has had little trouble finding American companies eager to enlist it, anonymously, to fight their political battles and pay handsomely for its help.

And these contributions, some of which can be pieced together through tax filings of corporate foundations and other public records, also show how the chamber has increasingly relied on a relatively small collection of big corporate donors to finance much of its legislative and political agenda. The chamber makes no apologies for its policy of not identifying its donors. It has vigorously opposed legislation in Congress that would require groups like it to identify their biggest contributors when they spend money on campaign ads.

Proponents of that measure pointed to reports that health insurance providers funneled at least $10 million to the chamber last year, all of it anonymously, to oppose President Obama’s health care legislation.

“The major supporters of us in health care last year were confronted with protests at their corporate headquarters, protests and harassment at the C.E.O.’s homes,” said R. Bruce Josten, the chief lobbyist at the chamber, whose office looks out on the White House. “You are wondering why companies want some protection. It is pretty clear.”

The chamber’s increasingly aggressive role — including record spending in the midterm elections that supports Republicans more than 90 percent of the time — has made it a target of critics, including a few local chamber affiliates who fear it has become too partisan and hard-nosed in its fund-raising.

The chamber is spending big in political races from California to New Hampshire, including nearly $1.5 million on television advertisements in New Hampshire attacking Representative Paul W. Hodes, a Democrat running for the United States Senate, accusing him of riding Nancy Pelosi’s “liberal express” down the road to financial ruin.

“When you become a mouthpiece for a specific agenda item for one business or group of businesses, you better be damn careful you are not being manipulated,” said James C. Tyree, a former chairman of the Chicagoland Chamber of Commerce, who has backed Republicans and Democrats, including Mr. Obama. “And they are getting close to that, if not over that edge.”

But others praise its leading role against Democrat-backed initiatives, like health care, financial regulation and climate change, which they argue will hurt American businesses. The Obama administration’s “antibusiness rhetoric” has infuriated executives, making them open to the chamber’s efforts, said John Motley, a former lobbyist for the National Federation of Independent Business, a rival.

“They’ve raised it to a science, and an art form,” he said of the chamber’s pitches to corporate leaders that large contributions will help “change the game” in Washington.

As a nonprofit organization, the chamber need not disclose its donors in its public tax filings, and because it says no donations are earmarked for specific ads aimed at a candidate, it does not invoke federal elections rules requiring disclosure.

The annual tax returns that the chamber releases include a list of all donations over $5,000, including 21 in 2008 that each exceed $1 million, one of them for $15 million. However, the chamber omits the donors’ names.

But intriguing hints can be found in obscure places, like the corporate governance reports that some big companies have taken to posting on their Web sites, which show their donations to trade associations. Also, the tax filings of corporate foundations must publicly list their donations to other foundations, including one run by the chamber.

These records show that while the chamber boasts of representing more than three million businesses, and having approximately 300,000 members, nearly half of its $140 million in contributions in 2008 came from just 45 donors. Many of those large donations coincided with lobbying or political campaigns that potentially affected the donors.

Dow Chemical , for example, sent $1.7 million to the chamber in the past year to cover not only its annual membership dues, but also to support lobbying and legal campaigns. Those included one against legislation requiring stronger measures to protect chemical plants from attack.

A Dow spokesman would not discuss the reasons for the large donation, other than to say it supports the chamber’s work.

Prudential Financial’s $2 million donation last year coincided with a chamber lobbying effort against elements of the financial regulation bill in Congress. A spokesman for Prudential, which opposed certain proposed restrictions on the use of financial instruments known as derivatives, said the donation was not earmarked for a specific issue.

But he acknowledged that most of the money was used by the chamber to lobby Congress.

“I am not suggesting it is a coincidence,” said the spokesman, Bob DeFillippo.

More recently, the News Corporation gave $1 million to support the chamber’s political efforts this fall; Chairman Rupert Murdoch said it was in best interests of his company and the country “that there be a fair amount of change in Washington.”

Business interests also give to the chamber’s foundation. Its tax filings show that seven donors gave the foundation at least $17 million between 2004 and 2008, about two-thirds of the total raised.

These donors include Goldman Sachs , Edward Jones, Alpha Technologies, Chevron Texaco and Aegon , which has American subsidiaries and whose former chief executive, Donald J. Shepard, served for a time as chairman of the U.S. Chamber of Commerce’s board.

Another large foundation donor is a charity run by Maurice R. Greenberg, the former chairman of the insurance giant A.I.G. The charity has made loans and grants totaling $18 million since 2003. U.S. Chamber Watch, a union-backed group, filed a complaint with the Internal Revenue Service last month asserting that the chamber foundation violated tax laws by funneling the money into a chamber “tort reform” campaign favored by A.I.G. and Mr. Greenberg. The chamber denied any wrongdoing.