I became involved in several cases of mass killing. Some were argued as crimes against humanity, the killings of individuals on a large scale, and others gave rise to allegations of genocide, the destruction of groups. These two distinct crimes, with their different emphases on the individual and the group, grew side by side, yet over time genocide emerged in the eyes of many as the crime of crimes, a hierarchy that left a suggestion that the killing of large numbers of people as individuals was somehow less terrible.