Operating in early twentieth-century Rome, he exploited the loneliness of women who responded to personal advertisements, methodically targeting and killing at least three of them over a four-year span. The comparison to Henri Landru — the French wife-killer whose name became synonymous with predatory matrimonial fraud — reflects both his method and the calculated patience with which he selected victims. He was tried, convicted, and executed in 1933.

A former law enforcement officer who turned his training and discipline toward systematic killing, Pardo carried out a series of murders in Florida in 1986 that left nine people dead — crimes he approached with apparent deliberateness rather than impulse. His background in policing shaped both the method of the killings and the prosecution's case against him, and he spent over two decades on death row before his execution in 2012.

His killings spanned fifteen years across southern California before investigators caught up with him, making Kearney one of the longer-operating serial killers of the twentieth century. The victims — young men and boys — were targeted, assaulted, and disposed of with a methodical consistency that earned him two separate nicknames tied to his methods. His 1978 guilty plea to twenty-one counts of murder resulted in consecutive life sentences, and he was later identified as the first of three distinct predators operating in the same region during overlapping decades.

His place on this site rests less on the combat sports he helped build than on his roots in organized crime, which shaped how early professional fighting in Japan was structured and controlled. As both a yakuza figure and a promoter, Kanō occupied a space where underworld influence and athletic spectacle reinforced each other, a pattern that would mark combat sports promotion in various countries well into the twentieth century.

The Parkland shooting of February 2018 stands among the deadliest school attacks in American history, and the record Cruz left behind — on social media and in his documented behavioral history — made clear that the warning signs had accumulated over years. The scale of the event, seventeen dead and seventeen more wounded, helped drive a renewed national debate over school safety, gun access, and the gaps in systems meant to identify and intervene with at-risk individuals.

A career Gambino family operative who climbed from bookmaking and loan-sharking to the upper reaches of one of New York's most prominent organized crime families, LoCascio is notable less for singular acts than for his decades of sustained institutional loyalty — loyalty that ultimately cost him his freedom and, reportedly, very nearly his life. His 1992 conviction alongside John Gotti, and the subsequent life sentence handed down in federal court, marked the effective end of the Gambino administration that had dominated tabloid headlines through the late 1980s. The postscript supplied by Gravano's account — an alliance allegedly formed in a jail cell to kill the boss they both served — offers an unusually candid glimpse into the internal fractures that brought that administration down.

Gary operated across two states during the mid-to-late 1970s, targeting elderly women in a series of attacks that drew intense law enforcement scrutiny in Columbus, Georgia — a city gripped by fear during what became known as the Stocking Strangler case. The confirmed killings represent only part of what investigators believed to be a broader pattern of violence, and his case remained legally contested for decades before his 2018 execution.

A celebrated inventor whose neon lighting transformed the visual landscape of modern cities, Claude presents a case study in how scientific prestige offered no moral insulation against political catastrophe. His active collaboration with Nazi occupiers in France during World War II stands in stark contrast to decades of celebrated innovation, and the postwar stripping of his honors reflected a judgment by his own country on the uses to which his influence had been put.