In a ruling hailed by corporate-accountability and labor activists, the California Supreme Court has held that corporations may be liable under the state's consumer-protection laws for misleading advertising or public statements about their products or operations.Just do it: don't lie.A majority of four of the seven Court justices ordered the trial court to proceed with a case brought by Marc Kasky, an activist who charged that Nike, Inc., made false statements about conditions in Asian factories used to produce its shoes and apparel in order to counter criticism that the company was using "sweatshop" labor.