His killing spree lasted less than five months, but the six murders Weidmann committed across France in 1937 — targeting tourists, a nurse, a chauffeur, and others lured by false promises — carried a cold operational logic: each victim was chosen for their vulnerability and relative isolation. What distinguished his case in the historical record was less the scale than the aftermath: his public guillotining outside Saint-Pierre Prison drew such a frenzied crowd that French President Albert Lebrun moved immediately to abolish public executions entirely. The spectacle that ended Weidmann's life thus closed a chapter of French penal history that stretched back to the Revolution.

A trained midwife who ran a maternity home during the desperate postwar years, Ishikawa turned professional trust into a mechanism of systematic neglect, allowing infants in her care to die while soliciting payment from their impoverished parents for the service. Prosecutors alleged at least twenty-seven deaths among eighty-four infant fatalities across roughly two years of operation, with the ashes of over seventy infants eventually recovered from a mortician's home and a temple. The case exposed similar practices at eleven other Tokyo maternity homes and contributed directly to Japan's legalization of abortion for economic reasons in 1949. Ishikawa ultimately served four years, denied responsibility until the end of her life, and ran a real estate office into her eighties from the same address as the maternity home.

A French naval officer who extended his career into the Atlantic slave trade, Landolphe represents the institutional machinery that sustained one of history's most destructive commerce systems — state-sanctioned, professionally organized, and operating at scale. His 1786 mission to establish African trading posts illustrates how the trade relied not on rogue actors but on disciplined functionaries operating within official frameworks.

Woodham carried out two separate acts of lethal violence on the same morning in 1997, first at home and then at school, making his case one of the earlier instances of what became a recognized pattern in American school shootings. The Pearl, Mississippi attack predated the more widely covered school shootings later in the decade and drew attention to warning signs that investigators and schools had largely lacked frameworks to address.