Brooks was one of two teenage accomplices who helped Dean Corll carry out what became known as the Houston Mass Murders, one of the deadliest serial killing cases in American history at the time of its discovery. His role was active rather than incidental — participating in abductions and providing access to victims during a three-year period in which at least 29 boys and young men were killed. The scale of the crimes remained hidden partly because of how ordinary the perpetrators appeared within their communities.

A trained physician who rose to the rank of SS-Standartenführer, Pfannenstiel represents the troubling convergence of medical authority and state-sanctioned atrocity within the Nazi apparatus. His professional credentials lent a veneer of institutional legitimacy to the machinery he served, a pattern common among those who enabled systematic harm through expertise rather than force alone. He lived to ninety-two, long outlasting the regime whose structures he had joined and served.

Rascher operated at the intersection of institutional medicine and state-sanctioned atrocity, using concentration camp prisoners — primarily at Dachau — as unwilling subjects in experiments designed to serve military ends. His access to Himmler's patronage gave his work a veneer of official legitimacy while insulating him from professional scrutiny. The experiments on hypothermia and altitude exposure caused prolonged suffering and death, and the data they generated remains ethically contested to this day.

The gap between what investigators suspected and what the courts could prove defines Pękalski's case: convicted of a single murder, yet believed responsible for at least seventeen deaths across nearly a decade. His 1992 arrest began as a rape case, and the full scope of his suspected crimes was never legally established, leaving many cases formally unresolved. His release in 2017, followed by mandatory psychiatric evaluation, reflects the difficulty Polish authorities faced in balancing the limits of the evidence against lingering public safety concerns.

The Meyssonnier name had been tied to state execution across several centuries by the time Maurice took up the role in French Algeria, making him less an anomaly than a continuation of an inherited institution. He carried out a significant number of executions during the colonial period, including the last guillotining of a woman in Algeria in 1948, and passed the role to his son Fernand, who would serve as the final executioner in French Algeria. His presence on this site reflects not personal criminality but a position at the intersection of state violence, colonial justice, and a profession that France itself would eventually abolish.

His face appears in one of the most recognized photographs of the Holocaust — weapon in hand, standing over a child with raised arms during the suppression of the Warsaw Ghetto Uprising. That image, preserved in the Stroop Report and later used as evidence in war crimes prosecutions, fixed him in the historical record long before he was identified by name. His actions on the ground went well beyond that moment, encompassing executions, massacres, and deportations that earned him a reputation among victims and witnesses for exceptional brutality.

A nurse working in Leeds hospital wards, Norris occupied a position of trust that gave him regular, unsupervised access to vulnerable patients and controlled substances. His conviction rested on a pattern of suspicious hypoglycaemic collapses that followed him between two separate hospitals, combined with circumstantial evidence placing him alone with victims at critical moments. The case has remained contested on forensic grounds, with expert disagreement over whether the insulin detected in victims was externally administered — though the absence of C-peptides in blood tests has been cited as significant counter-evidence to natural causation.

His nickname — "Tony Ducks" — was earned through decades of evading prosecution, and it captures something essential about how he operated: careful, patient, and largely invisible to the public while exercising deep structural influence over New York's labor and construction industries. Corallo's power rested less on violence than on institutional corruption, with tentacles reaching into trucking unions, the waste hauling business, and major infrastructure projects across the city. It was ultimately a wiretap on a subordinate's car — capturing Corallo speaking candidly about Mafia Commission business — that provided federal prosecutors with the evidence needed to convict him at the 1986 Commission Trial.