Scully operated out of the Philippines, where he produced and distributed child sexual abuse material that investigators described as among the most severe they had encountered. His case drew international attention both for the nature of the recorded offenses and for the transnational networks through which that material circulated. He was convicted on trafficking and assault charges and sentenced to life imprisonment in 2018, with additional criminal proceedings related to alleged murder still unresolved at the time of his sentencing.

His prominence rested on commerce built on enslaved labor, and the infrastructure he helped create — the West India Docks — was designed specifically to service that trade at scale. As a leading figure in the West India interest, Hibbert wielded political and economic influence to defend and entrench the slave economy at a moment when abolitionist pressure was mounting.

Regarded as the first serial killer in Flanders, his crimes in 1964 and 1965 marked a grim threshold in Belgian criminal history. Operating in the Linkeroever district of Antwerp, he targeted women in the span of a few months, leaving two dead before his capture. A death sentence was handed down in 1966 — a rare judicial outcome in postwar Belgium — though he ultimately died in prison decades later.

Operating during a period of intense ethnic and criminal violence in Guyana, Khan built an organization that combined large-scale cocaine trafficking with what amounted to a private paramilitary force. The alleged ties between his "Phantom Squad" and elements of the Guyanese state gave his operations a particular impunity, blurring the line between organized crime and extrajudicial enforcement. Over two hundred deaths have been attributed to his network in just four years.