---
category: "Extremism & Violent Networks"
tags:
  - Person
  - NeoNazi
  - SonnenkriegDivision
  - O9A
  - UK
  - TerroristConviction
  - Accelerationism
  - London
location: "West London, England"
created: 2026-05-22
updated: 2026-05-22
summary: "Oskar Dunn-Koczorowski was an 18-year-old from West London who was a Sonnenkrieg Division member sentenced in June 2019 to an 18-month Detention and Training Order at the Old Bailey for two counts of encouraging terrorism via Gab posts supporting Anders Breivik and calling for ethnic cleansing."
---

Oskar Dunn-Koczorowski, 18, of West London, was a member of [[Sonnenkrieg Division]] (SKD), the British neo-Nazi accelerationist organisation proscribed in February 2020. He was sentenced at the [[Old Bailey]] on 18 June 2019 by Judge [[Rebecca Poulet QC]] to an 18-month Detention and Training Order after pleading guilty to two counts of encouraging terrorism under section 1 of the [[Terrorism Act 2006]].[^1]

### Offences

Dunn-Koczorowski operated a personal Gab account under a pseudonym and shared administrative control of SKD's [[Gab]] page alongside co-defendant [[Michael Szewczuk]]. The Gab posts for which he was convicted included:

Material expressing support for [[Anders Behring Breivik]], the Norwegian far-right extremist who killed 77 people in the 2011 [[Utoya]] attack and Oslo bombing.

Content calling for the ethnic cleansing of Albanians.

He pleaded guilty in December 2018 to the two encouraging terrorism counts; sentencing was deferred until June 2019. He did not face possession charges.

### Sentencing Remarks

Judge Rebecca Poulet QC described the content produced by both Dunn-Koczorowski and Szewczuk as "abhorrent as well as criminal by reason of their clear intention to encourage terrorist acts."[^2] The lighter sentence compared to Szewczuk reflected both the fewer counts and the lesser volume of material attributed to Dunn-Koczorowski.

### Sonnenkrieg Division and O9A

Sonnenkrieg Division was founded by [[Andrew Dymock]] following his departure from the [[System Resistance Network]] and incorporated [[Order of Nine Angles]] (O9A) philosophy heavily into its ideology, distinguishing it from its National Action-successor predecessor. Dunn-Koczorowski and Szewczuk were the first SKD members to face prosecution; their sentences preceded SKD's formal proscription, which followed in February 2020.

### Footnotes

[^1]: Washington Post. "Two British teens just convicted for promoting far-right terrorism online." June 18, 2019. https://www.washingtonpost.com/world/2019/06/18/two-british-teens-just-convicted-promoting-far-right-terrorism-online/; IOL News. "Neo-Nazi teen who called Prince Harry a 'race traitor' jailed." June 19, 2019. https://iol.co.za/news/world/2019-06-19-neo-nazi-teen-who-called-prince-harry-a-race-traitor-jailed/

[^2]: HOPE not hate. "Jailed neo-Nazi Satanists were a legacy of National Action." June 18, 2019. https://hopenothate.org.uk/2019/06/18/jailed-neo-nazi-satanists-legacy-national-action/