In 1989, four Afrikaner nationalists and one German mercenary killed a security guard at a United Nations outpost in Namibia. After escaping from custody, they fled home to South Africa. A possibly non-existent group called The White Wolves took credit for the wave of bombings that followed. 

Sources:

Du Preez, M. (2010). Pale native: Memories of a Renegade reporter. Zebra Press. 

Rotberg, Robert (1988). The Founder: Cecil Rhodes and the Enigma of Power. Oxford University Press. 

Falkof, Nicky. The End of Whiteness: Satanism and Family Murder in Late Apartheid South Africa. Johannesburg: Jacana Media, 2016.

https://www.dailymaverick.co.za/article/2021-09-09-bruce-and-leonard-a-sad-african-immigrant-tale-of-injustice/

https://www.nytimes.com/1990/01/19/world/outjo-journal-un-namibia-team-makes-some-unlikely-friends.html

https://web.archive.org/web/20010429091808/http://www.un.org/documents/ga/res/spec/aress14-1.htm 

https://www.saflii.org/za/cases/ZASCA/1999/72.html 

https://www.upi.com/Archives/1989/08/11/Gunmen-attacked-a-UN-peace-keeping-force-adminstrative-headquarters-and/6550618811200/ 

https://ctc.westpoint.edu/the-nexus-between-far-right-extremists-in-the-united-states-and-ukraine/

https://digitalcommons.unomaha.edu/cgi/viewcontent.cgi?article=1043&context=ncitereportsresearch

https://web.archive.org/web/20181118212149/

https://www.iol.co.za/pretoria-news/the-day-wit-wolf-turned-pretoria-red-with-blood-18125595 

https://www.jordanharbinger.com/bradley-steyn-undercover-with-mandelas-spies-part-one/ 

https://theafricancriminologyjournal.wordpress.com/2022/02/04/south-africa-the-strijdom-square-massacre/ 

https://www.iol.co.za/news/world/us-wit-wolf-slaughter-1873433 

https://www.iol.co.za/news/south-africa/what-became-of-the-big-wit-wolf-424408