Over a span of sixteen years, McGregor carried out a series of sexual assaults and killings in the Greater Houston area, targeting four women while maintaining the appearance of ordinary working life as a delivery driver. The prolonged timeline — stretching from 1990 to 2006 — reflects both the difficulty authorities faced in connecting the crimes and the sustained nature of the violence involved.

Crawford's case is shaped not only by the crimes themselves but by the documented indifference that surrounded them — his victims were Indigenous women in Saskatchewan and Alberta, and the relative absence of media attention drew criticism that their deaths were treated as less urgent by both press and authorities. He had already served time for a killing in 1981 before going on to murder three more women in 1992, whose remains were discovered by a hunter two years later. The gap between his crimes and their resolution, and the broader context of violence against Indigenous women in Canada, gives his case a significance that extends beyond the individual acts.

As head of the NKVD during some of the Soviet Union's most violent years, he commanded the machinery of state terror with unusual administrative competence — organizing mass executions, deportations, and purges on a scale that shaped the fate of millions across Eastern Europe and the Soviet interior. His longevity at the apex of the security apparatus, outlasting rivals who were themselves consumed by the system, speaks to a particular talent for navigating — and perpetuating — structures of extreme institutional violence. The Katyn massacre alone, which he personally ordered, became one of the defining atrocities of the Second World War era.