Over roughly a year and a half, Tagirov systematically targeted elderly women across Tatarstan, ultimately killing 31 of them — a concentrated campaign that made him one of Russia's more prolific serial killers of recent decades. The geographic focus on a single republic and the vulnerability of his victims gave the case an unusually grim coherence, and it would be more than a decade before a life sentence was handed down in 2024.

Convicted of four killings but suspected in as many as eighteen, Gufler represents a category of mid-century criminal whose full scope of harm was never legally established. The gap between confirmed and suspected victims raises questions about investigative capacity and what went undetected — or unprosecuted — in postwar Austria.

His crimes unfolded across a span of months in 2002, each killing tied to robbery — apartments, taxis, a village store — with victims chosen opportunistically and the amounts stolen often numbering in the thousands of rubles. What extended his presence on a site like this is less the scale than the duration: Lozovoi evaded capture for six years while on an international wanted list, during which investigators suspected the confirmed murders represented only part of his record. Psychiatric evaluation described him not as psychotic but as a sane, excitable psychopath — a distinction that carried legal weight at sentencing.

His sixteen months in power over Guatemala produced what historians and courts have documented as a systematic campaign of massacres against Indigenous Maya communities, carried out under the banner of counterinsurgency. A Guatemalan tribunal found him guilty of genocide and crimes against humanity in 2013 — the first such conviction of a former head of state by his own country's courts — before the verdict was overturned on procedural grounds. The scale of violence concentrated in his tenure, within an already brutal civil war, is what places him among the figures cataloged here.