Corporate backers of next year’s Olympic Games in China have done little or nothing to pressure Beijing to use its influence to end the genocide in Darfur, a human rights group asserted in a report released yesterday.

The group, Olympic Dream for Darfur, gave failing grades to the Darfur-related records of 16 of 19 prominent companies with ties to the games.

“This is blood money. I think they should step up and do the right thing,” an actress active with the Darfur group, Mia Farrow, told reporters on a conference call yesterday. Despite repeated requests, none of the 19 firms gave any indication that it had raised the Darfur violence with the Chinese government, the group said. Beijing’s oil companies and diplomats have close relationships with the Sudanese government, which is widely considered to be facilitating the killing in Darfur. Only two Olympic sponsors, General Electric and McDonald’s, reported that they expressed concern about the issue to the International Olympic Committee.

“The corporate Olympic sponsors are engaged in a form of silent complicity with the Chinese government in its support of the genocide,” the report’s author, Ellen Freudenheim, said.

A spokeswoman for the Chinese Embassy in Washington did not return a call seeking comment for this article.

Ms. Freudenheim said her group’s requests to the sponsor companies had largely been ignored, though they were quite modest. “We didn’t ask them to come up with policy. We didn’t actually ask them to lobby. We simply asked them to raise the issue,” she said.

The report’s highest grade, C+, went to General Electric. The company, which is providing equipment for Olympic venues in Beijing and will broadcast the games through its subsidiary, NBC, designated a point person to address the Darfur issue, gave $2 million through a foundation to refugee relief, and contacted the IOC.

The companies given Fs in the report were Anheuser-Busch, Atos Origin, BHP Billiton, Eastman Kodak, Lenovo, Manulife Financial, Microsoft, Panasonic, Samsung, Staples, Swatch Group, Visa International, and Volkswagen. The group said Atos, Panasonic, and Samsung ignored inquiries about the issue.

The report notes that several companies seemed to have coordinated their responses and included similar language suggesting that the Darfur issue was best addressed by the United Nations and national governments.

Asked whether she thought the companies were fearful of alienating the Chinese government, Ms. Farrow, who has made seven trips to Darfur, was withering in her reply. “Fear of losing money, is that real fear?” she asked. “Not compared to the women who are being attacked today, not compared to the children who are being thrown in bonfires today. I’ve seen a different kind of fear.”

The group also said it was keeping up pressure on a film director and producer who is acting as an artistic adviser for the opening and closing ceremonies in Beijing, Steven Spielberg. “Mr. Spielberg should suspend his participation in the Olympics until there’s peace on the ground,” the group’s director, Jill Savitt, said.

Earlier this year, after Ms. Farrow warned publicly that Mr. Spielberg could become “the Leni Riefenstahl of the Beijing games,” the film mogul released a letter he sent to President Hu imploring China to take action to end the Darfur crisis.

“We’ve continued to push the Chinese,” a spokesman for Mr. Spielberg, Andrew Spahn, told The New York Sun. He said the director left a film set in September and flew to New York to meet the special envoy China appointed to address the Darfur violence.

Mr. Spahn said Mr. Spielberg sent another letter to Mr. Hu and other Chinese officials just prior to Thanksgiving “to try and move the Chinese to re-engage, so to speak, or step up their efforts.” The spokesman said the director urged the Chinese to act quickly. Ms. Farrow said the sponsors and the film director need to keep pressing China on the issue. “They have a unique position here with the Olympic Games, a unique kind of leverage, as does Mr. Spielberg, and I think unless they use it to their utmost, they will have failed in a profound, profound way,” she said.