Previte's career traced a continuous arc of institutional betrayal — first corrupting the police badge he carried, then embedding himself in organized crime, and finally selling out the organization he'd joined. What makes him a figure of particular note is the scope of his cooperation: a decade of FBI work that penetrated the Philadelphia crime family from within, compensated at a scale reflecting how valuable his access had become.

Shiraishi exploited social media to target individuals in psychological crisis, presenting himself as willing to assist with suicide pacts before abducting, assaulting, and killing them. The case drew particular attention to the vulnerabilities created by anonymous online platforms and the ease with which expressions of suicidal ideation could be weaponized. Nine victims were found dismembered in his Zama apartment in 2017, and the investigation prompted significant public debate in Japan about platform responsibility and crisis intervention.

His crimes unfolded across more than a decade, interspersed with prison terms that interrupted but did not end a pattern of sexual violence against victims who ranged from a young child to a young adult man. The Polish justice system ultimately pursued the death penalty, and he was executed in 1985 after both an appeal and a clemency request were denied. "Kazimierz Polus (10 September 1929 – 15 March 1985) was a Polish serial killer and pedophile who killed two young boys and an adult man."

A bodyguard and enforcer for Mickey Cohen, Stompanato operated on the margins of organized crime before his relationship with actress Lana Turner brought him into the tabloid spotlight — and ultimately to a violent end. The abuse he inflicted within that relationship culminated in his death at the hands of Turner's teenage daughter, Cheryl Crane, in an act a coroner's jury ruled justifiable homicide. The case drew enormous public attention in 1958, intertwining Hollywood celebrity with the uglier realities of domestic violence and mob-adjacent criminality.