The polarizing and powerful emotions surrounding gun ownership hit close to home Friday for University of Minnesota Professor Barbara Frey. Frey, director of the University's Human Rights Program through the Institute for Global Studies, was a special rapporteur on small arms for the United Nations from 2002 to 2006 and advocated for tighter gun regulation. Last Friday, Frey started to receive "hate mail" from people, she said. At first she didn't understand why this would appear now, because her last report had appeared in 2006. Then she discovered an article posted online at the end of January by the National Rifle Association, in which Frey and a report she had written were cited.