Rolling's August 1990 attacks unfolded across a single weekend in a college town, targeting students at the start of a new academic year — a combination of timing, setting, and method that produced an atmosphere of acute public fear across Florida. The Gainesville murders were preceded by an earlier triple homicide in Louisiana and an attack on his own father, establishing a pattern of escalating violence that predated his more widely known crimes. He was executed in 2006, twelve years after his sentencing.

His longevity in organized crime — spanning Prohibition speakeasies through Cold War–era Cuban casinos — made him one of the more durable figures in twentieth-century American mob history. What distinguished Alo was less overt violence than institutional patience: the systematic cultivation of political and law enforcement relationships that allowed his Florida gambling operations to run for nearly two decades without meaningful opposition. Federal prosecutors eventually ranked him among the most significant organized crime figures in the country, a designation that reflected the breadth of his financial reach rather than any single dramatic act.

Franklin built what was likely the largest slave trading enterprise in antebellum America, systematically scaling the domestic trade through coastwise shipping, aggressive credit arrangements, and the absorption or elimination of competitors. His operation moved enslaved people from the Upper South to the labor-hungry markets of the Deep South in volumes that reflected a deliberate corporate logic rather than incidental commerce. The wealth he accumulated placed him among the planter elite, and the infrastructure his firm developed helped entrench the internal slave trade as an economic institution in its own right.

Operating in rural Provence over a brief but lethal span, Sasia targeted shepherds and isolated laborers — men unlikely to be quickly missed — killing at least four in the Draguignan region for what amounted to petty theft. The choice of victims and setting reflected a calculated opportunism rather than frenzy, which is part of what made the case notable in interwar France. He was tried and guillotined within two years of the killings.

Kürten's 1929 killing spree in Düsseldorf unfolded against the backdrop of Weimar Germany's social instability, and the case drew widespread public attention both for its duration and for the forensic and psychological inquiry it prompted. His criminal history extended well before the murders, encompassing arson and attempted murder across many years, suggesting a pattern of escalating violence rather than a sudden rupture. Psychiatrist Karl Berg's extensive interviews with Kürten produced one of the early systematic studies of a serial offender's psychology, lending the case lasting significance in the history of criminology.