A gambling addiction appears to have driven the method and the motive: Blauensteiner sought out elderly, wealthy companions, secured her place in fabricated wills, and used poison to collect. Convicted of three murders, she was suspected by Austrian authorities of having killed at least ten people across a pattern that spanned years and required the complicity of a lawyer to sustain.

His trajectory from national wrestling champion to the dominant crime figure across the Balkans illustrates how Bulgaria's post-communist transition created openings that organized crime moved quickly to fill. Operating through companies with legitimate facades, Iliev built an empire spanning extortion, contract killings, and embargo-busting petroleum smuggling into Serbia — the latter generating millions during a period of international sanctions. His assassination in Sofia was coordinated precisely enough to draw the Interior Minister to the scene, a measure of how seriously the state took his removal — or his presence.

Walsh built his fortune through the Atlantic slave trade, operating out of Nantes at a time when French merchant houses were central to the systematic trafficking of enslaved Africans. His role as a ship owner placed him directly within the commercial infrastructure that sustained the trade — financing voyages, providing vessels, and profiting from human cargo across the Middle Passage.

Among the early architects of Mafia mythology, Cascio Ferro shaped what it meant to be a capo in the Sicilian tradition — projecting the image of a dignified, almost aristocratic authority while maintaining ruthless operational control on both sides of the Atlantic. His alleged role in the 1909 assassination of Detective Joseph Petrosino, the most prominent American lawman targeting Italian organized crime, marked a turning point in the relationship between the Mafia and law enforcement. That he was never convicted, and that the killing only deepened his legend, says much about the institutional insulation he had cultivated over decades.

His position within French law enforcement — spanning the Gendarmerie and the National Police across more than three decades — gave him both proximity to investigations and a degree of institutional cover that likely contributed to how long he evaded identification. The murders attributed to him began with an eleven-year-old girl in 1986 and extended through the mid-1990s, with additional rapes connected to the same period. He was not identified until 2021, when a DNA summons prompted him to take his own life before he could be formally confronted. The case became a notable example of how institutional trust can shield perpetrators even within the systems designed to detect them.

Bolin spent decades on Florida's death row while his cases wound through an unusually prolonged series of trials and appeals, making him a figure of note in discussions of capital punishment and criminal procedure as much as for the crimes themselves. He was convicted of three separate murders of young women in the Tampa Bay area in 1986, crimes that went unsolved for years before forensic and witness evidence tied them to him. The gap between offense and conviction, and the multiple retrials that followed, placed his cases at the intersection of evolving legal standards and violent crime.

Operating in Detroit over a five-year span, Brooks targeted women already living on the margins — prostitutes and homeless drug addicts — whose disappearances were less likely to draw immediate attention. The pattern of seven confirmed killings, with bodies disposed of in abandoned buildings, reflects a deliberate concealment strategy that prolonged his activity. It was an unrelated sexual assault arrest in 2006 that ultimately brought him into contact with DNA evidence tying him to the series of murders.