ANNAPOLIS, MD. (AP) – A federal lawsuit has been filed by leading national trade associations challenging Maryland’s first-in-the-nation tax on internet ads. The groups filed the lawsuit in U.S. District Court in Baltimore. Plaintiffs include the U.S. Chamber of Commerce, NetChoice, and the Computer and Communications Industry Association. The plaintiffs lead attorney says the law is a clear violation of federal statutory and constitutional principals. The lawsuit alleges that the law violates the federal Internet Tax Freedom Act. The Maryland General Assembly overrode Gov. Larry Hogan’s veto of the legislation last week.