Construction work has been ordered stopped at three projects being developed by a company owned by a Jersey City official over state allegations of unpaid wages, overtime pay and improper classification, a construction union said. The state Department of Labor issued the stop-work orders Wednesday for two Jersey City developments: the 33-story Imperial Tower and a 13-story project, both in Journal Square; and the 11-story Braddock project in North Bergen, according to the Laborers’ International Union of North America (LiUNA). All three projects are being developed by Euro Concrete, which is c…