The United States had a taste of such a gap during the Vietnam War. At the time, academic scientists found themselves caught in the crosshairs of zealous anti-war activists who, despite scant evidence, accused them broadly of collaborating on weapons research in support of the war. In 1970, the situation reached a violent crescendo with the death of Robert Fassnacht, a physicist at the University of Wisconsin–Madison who was working in a building that was bombed by anti-war protesters.