Washington is suddenly looking very unkind to the firm that used to be known as “Government Sachs.” Now the Senate’s Permanent Subcommittee on Investigations, led by Carl Levin, Democrat of Michigan, is planning to focus hearings scheduled for next week at least in part on Goldman Sachs’s role in the financial disaster. Levin’s staff has uncovered new documents “that link certain actions to specific people” at Goldman, according to a senior legislative official who spoke on condition of anonymity. The official would not divulge the nature of the allegation but said that Levin believes it amounts to “another big shoe to drop on Goldman.” Spokespeople for Levin said they were not prepared to discuss the nature of the probe, but his committee has been conducting several weeks of hearings and one is planned for April 27 on “the role of the investment banks.” “We expect to have some information tomorrow,” spokesman Bryan Thomas said Monday.