Hazzard built a practice around extreme fasting protocols administered at her Washington sanitarium, attracting patients who believed they were seeking legitimate medical care. What distinguished her case was the combination of genuine institutional credibility — she had secured a medical license and operated a recognized facility — and systematic financial predation on the patients under her care. The gap between her self-presentation as a therapeutic pioneer and the deaths of at least fifteen people made her one of the more quietly methodical figures in the history of medical fraud.

Few figures navigated the intersection of street violence and organized enterprise as smoothly as Madden, who rose from the lethal gang culture of Hell's Kitchen to become one of Prohibition-era New York's most influential criminal operators. His longevity in a world that consumed most of its participants — and his eventual quiet retirement in Hot Springs, Arkansas — speaks to a particular kind of cold discipline beneath the reputation. The nickname came honestly, earned through years of gang warfare before the more lucrative business of bootlegging reshaped what power looked like in the underworld.

His crimes spanned two years in Kraków during the mid-1960s, targeting victims across age groups with an apparent randomness that made the attacks difficult to anticipate or pattern. The courtroom evidence and the breadth of those targeted gave rise to a nickname that lodged him firmly in Polish criminal memory.

Kemper's case stands out for the combination of his methodical conduct and his willingness to engage openly with investigators — his lengthy interviews with FBI behavioral scientists became foundational material for the study of serial offenders. His crimes spanned less than a year in the early 1970s but encompassed a range of victims and relationships, including family members, that gave researchers an unusually complete psychological profile to work with. When California's suspension of capital punishment left him with life sentences instead of the death he had requested, he settled into an incarceration that has lasted decades, during which his cooperation with law enforcement continued.

His consolidation of power over the Soviet party apparatus during the 1920s laid the groundwork for decades of political terror, forced collectivization, and mass deportations that reshaped — and ended — millions of lives. The mechanisms he built, from the gulag system to the purges of the late 1930s, were distinguished by their bureaucratic thoroughness as much as their scale. Estimates of deaths attributable to his governance range into the tens of millions, placing him among the most consequential wielders of state violence in the twentieth century.