Finland's most documented serial killer of the postwar era, Junni operated largely within familiar social circles — targeting people close to him, including his wife, and returning repeatedly to the same geographic area. What distinguished his crimes beyond their number was a consistent and deliberate pattern of removing or collecting his victims' teeth, a behavior that gave investigators a rare forensic signature. His case remains one of the more closely studied examples of serial violence in Scandinavian criminological literature.

His own words provided the clearest record of his intent: he referred to himself as the "Serb Adolf Hitler" and stated openly that killing Muslims was his goal. Operating as a camp guard at Luka during the Bosnian War, he carried out crimes against humanity on a scale that resulted in convictions across thirty-one counts before the ICTY. The acquittal on genocide — not an exoneration, but a matter of legal threshold — has itself become a reference point in scholarly debates about how international courts define and prove genocidal intent.

Active in and around Rome across a single concentrated period in the early 1980s, Giugliano targeted women in a region whose rural outskirts left victims isolated and cases difficult to close. The uncertainty in the victim count reflects both the investigative challenges of the era and the fragmented evidence linking him to each crime. His later killing of a fellow patient while institutionalized underscored that confinement alone did not mark a clean conclusion to his history of violence.

What made Little so difficult to stop was how effectively he operated in the margins — targeting women whose disappearances went unreported or uninvestigated for years, allowing him to continue for more than three decades. The scale of confirmed victims places him in a category unlike any other documented case in American criminal history.

His rule spanned four decades, making him one of the longest-serving leaders in modern history — a tenure built on the suppression of political opposition, state-sponsored terrorism abroad, and an ideological framework that concentrated near-absolute power in his own hands. The 1969 coup that brought him to power was swift and largely bloodless, but what followed was a system of governance that eliminated dissent domestically while funding and directing violence well beyond Libya's borders. His fall in 2011 was as chaotic as his rule had been controlled, ending in his capture and killing by rebel forces.