Metin Kaplan (born 14 November 1952) is the leader of the Islamic extremist movement Kalifatsstaat ("Caliphate State") which is based in Cologne, Germany.

Paul De Lucia (born Felice De Lucia, Italian: [feˈliːtʃe de luˈtʃiːa]; November 14, 1897 – October 11, 1972), known as Paul Ricca (, Italian: [ˈrikka]), was an Italian-American mobster who served as the alleged nominal or de facto leader of the Chicago Outfit for 40 years. In 1958 he was named "the country's most important criminal" by a Senate crime investigating subcommittee.

Maria Serraino (1931 – 7 December 2017) was an Italian criminal and a member of the 'Ndrangheta mafia-style organization in Calabria. She is one of the rare examples of a woman leading a 'Ndrangheta clan.

Richard Topcliffe (14 November 1531 – late 1604) was a priest hunter and practitioner of torture during the reign of Queen Elizabeth I of England and Ireland. A landowner and Member of Parliament, he became notorious as the government's chief enforcer of the penal laws against the practice of Catholicism.