Helmut Kallmeyer (8 October 1910 – 27 September 2006) was a German chemist in the era of National Socialism. He served as a consultant in Adolf Hitler's Chancellery (Kanzlei des Führers) for gasification methods.

Between 2010 and 2017, a total of eight men disappeared from the neighbourhood of Church and Wellesley, the LGBTQ village of Toronto, Ontario, Canada. The investigation into the disappearances, taken up by two successive police task forces, eventually led to Bruce McArthur, a 66-year-old self-employed Toronto landscaper, whom they then arrested on January 18, 2018.

Víctor Carranza Niño (8 October 1935 – 4 April 2013), often referred to as Don Víctor was a Colombian emerald dealer and the owner of emerald mines in the Boyacá mountains (a forested area not far from Bogotá), widely known as Colombia's "emerald czar." The economy of the area around the mines is dependent on the trade. Carranza faced several legal challenges and investigations throughout his life.

John Factor (October 8, 1892 – January 22, 1984), born Iakov Faktorowicz and widely known as Jake "The Barber" Factor, was a Prohibition-era gangster and con artist affiliated with the Chicago Outfit.

Pedro Alonso López (born 5 October 1948 – disappeared 22 September 1999), also known as the Monster of the Andes, is a Colombian serial killer, child rapist, and fugitive who murdered a minimum of 110 people, mostly pre-teen girls, from 1978 to 1980. López claimed to have murdered over 300 people in Colombia, Ecuador, and Peru.