A class-action lawsuit filed Monday against Yahoo! Inc...accuses the company of engaging in "syndication fraud" against advertisers who pay Yahoo to display their ads on search results...The suit alleges that Yahoo defrauded pay-per-click advertisers who thought they were paying to have their ads displayed alongside search-engine results generated by certain keywords...The complaint alleges that "by placing ads into illegal platforms such as spyware programs, [Yahoo] wrongfully collected high search engine advertising fees for ads...Among the "spyware vendors" named in the complaint as partners in Yahoo's ad program are Direct Revenue and Intermix