In a voluminous new report reflecting two years of research, an influential Senate panel accuses Goldman Sachs of manipulating aluminum storage rules in order to line its own pockets, even as manufacturers and customers suffered.

Since 2010, when it acquired the metal storage company Metro International Trade Services, Goldman has engaged in a slew of manipulative "merry-go-round" trades in which aluminum slabs are moved from one warehouse facility to another, says the 396-page report by the Senate Permanent Subcommittee on Investigations, resulting in record U.S. fees for storing and shipping aluminum and, as a result, higher overall costs for aluminum-product manufacturers and consumers.