A Town of Oyster Bay ordinance targeting those who solicit work on local streets faces a federal court challenge by two groups that say it violates free-speech protections and singles out Latinos. The New York Civil Liberties Union filed the suit Tuesday in federal court in Brooklyn on behalf of Centro de la Comunidad Hispana ofLocust Valley, and the Workplace Project. The suit, which follows weeks of failed negotiations toward a compromise, accuses Oyster Bay and Town Supervisor John Venditto of unfairly caving to complaints from residents about day laborers. The plaintiffs are asking the court to declare the law unconstitutional…