The federal governmentâ??s top antitrust investigator told hundreds of farmers, lobbyists and others at a hearing Friday that the Department of Justice is keeping close watch on the nationâ??s dairy industry. Assistant Attorney General Christine Varneyâ??s said at the hearing on antitrust issues that the department wants to promote fairness in the dairy industry, which has experienced massive consolidation in recent years. “We are keeping a watchful eye on this industry,” Varney told about 500 people gathered for the daylong hearing at the University of Wisconsin-Madison campus. “We know that dairy farmers are concerned about a lack of choices for buyers as well as how their milk is priced.”