 Goldman Sachs is accused of asking for kickback bribes from institutional clients who made large profits flipping stocks which Goldman had intentionally undervalued in initial public offerings it was underwriting.Documents under seal in a decade-long lawsuit concerning eToys.com's initial public offering (IPO) in 1999 but released accidentally to the "New York Times" show that IPOs managed by Goldman were underpriced and that Goldman asked clients able to profit from the prices to increase business with it.The clients willingly complied with these demands because they understood it was necessary in order to participate in further such undervalued IPOs.