By Ryan Tracy And Christian Berthelsen 

WASHINGTON--Executives at three of Wall Street's biggest banks faced a grilling at a Senate hearing Thursday examining whether their commodity businesses wielded unfair market power or put the financial system at risk.

Sen. Carl Levin (D., Mich.), chairman of the Senate Permanent Subcommittee on Investigations, spent three hours accusing two witnesses from Goldman Sachs Group Inc. of manipulating aluminum markets. The senator, who is retiring at the end of this year, then took aim at J.P. Morgan Chase & Co. and Morgan Stanley for obscuring from regulators their investments in metals or natural gas.

"If you liked what Wall Street did for the housing market, you'll love what they're doing for commodities," Mr. Levin said, referring to a series of legal settlements over banks' handling of mortgages.

He said the profitable business for banks has brought on new risks to the firms and opportunities for foul play, declaring "it's time to reduce bank involvement with physical commodities."

The hearing centered on a report by the subcommittee's bipartisan staff finding banks' involvement in commodities was far more widespread than previously known and gave them an unfair advantage over other market participants. The investigation by Mr. Levin and Sen. John McCain (R., Ariz.) puts pressure on the Federal Reserve as it weighs policies that would scale back the role banks play in the markets. Fed Gov. Daniel Tarullo, one of the senior officials overseeing that review, is to testify before the subcommittee Friday.

The bulk of the hearing focused on activity at a Goldman aluminum-warehousing subsidiary, Metro International Trade Services LLC. A major aluminum purchaser and an independent analyst testified that the company's apparent strategy to increase wait times to withdraw metal from its Detroit-area warehouses had caused an unprecedented dislocation in aluminum markets that is driving up the prices of beer cans and cars.

A pair of Goldman Sachs executives said their actions didn't affect those prices and they were acting on orders from clients. In a series of testy exchanges with Messrs. Levin and McCain, the executives acknowledged the warehouse firm introduced a new transaction structure after Goldman bought it in 2010, causing metal transfers between warehouses that created a logjam and drove up wait times for customers to withdraw aluminum. Metro International's chief executive, Chris Wibbelman, said another part of Goldman, its commodity-trading arm, ordered withdrawals of 300,000 tons of aluminum from the warehouses and further extended wait times in 2012.

The hearing didn't provide evidence of collusion between Goldman traders and the warehouse executives, but senators said they weren't confident in voluntary bank policies to prevent that kind of wrongdoing. "There's little doubt that if we were talking about the stock market, rather than commodities transactions, the use of inside information that affects prices would be strictly prohibited," Mr. Levin said, suggesting the practice ought to be illegal.

Meanwhile, the senators also probed the myriad ways in which the huge orders for metal withdrawals benefited Goldman and Metro. A management document circulated to the Metro board showed that Metro's earnings grew roughly threefold after Goldman's purchase when the metal wait times began to lengthen, going from $67 million in 2009 to $211 million in 2012.

Though Goldman executive Jacques Gabillon testified the bank's policy ensured there was "not a single instance in which confidential information went to metals traders at Goldman Sachs," Mr. Levin introduced memos and emails showing that sensitive Metro data went to 50 Goldman executives, including two of the most senior executives in the commodity unit-- Isabelle Ealet, who has since become global co-head of the firm's securities division, and Greg Agran, who remains global co-head of commodities trading. And he introduced emails from Metro employees expressing concerns about the practices, including one who apparently quit after expressing concerns about information sharing after a confrontation involving a Goldman trader. Mr. Gabillon said the information circulated wasn't actionable by traders.

"I don't think we can rely on a private policy to ensure this doesn't happen," Mr. Levin said. "The stakes are too great. As far as I'm concerned, it should be illegal to share this kind of information. When you have a huge economic interest on the other side of ethical interests, too often the ethical interests give way."

Jorge Vazquez, founder and managing director of research consultancy Harbor Aluminum, testified that manufacturers have faced an additional $3.5 billion in costs since 2011 as a result of the wait times and increased prices caused by the tactics. "There are warehouse practices that may pose a conflict of interest," Mr. Vazquez said.

Commodity executives from Goldman, Morgan Stanley and J.P. Morgan faced questioning during an afternoon session on whether certain parts of their operations presented potential legal liability for their banks even though they are incorporated as separate entities.

Mr. Levin pointed out that although Goldman's uranium-trading subsidiary, Nufcor, is separately incorporated, all of its employees are from Goldman Sachs and all of its operations are managed by the bank.

For Morgan Stanley, he noted that a since-abandoned compressed-natural-gas business was merely a shell and that all the executives of the company were Morgan Stanley commodity executives, including co-head Simon Greenshields, who was testifying on the panel. In some cases the executives acknowledged the bank could be held liable for mishaps at the units.

Goldman Sachs, J.P. Morgan and Morgan Stanley said they effectively manage the risks from their commodities businesses.

Write to Christian Berthelsen at christian.berthelsen@wsj.com and Ryan Tracy at ryan.tracy@wsj.com

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