- Hamas
- Government of Israel
- Government of United Kingdom
- Government of United States
[EDIT: 2024-10-31] I should have included Germany here, but I didn’t realise until fairly recently they are one of the biggest arms suppliers to Israel. Otherwise though this post remains incredibly accurate. A follow-up is here.
[EDIT: 2026-03-12] Interesting re-visiting this in 2026 and thinking about which two terrorist organisations here are causing the most instability and uncertainty in the world.