- Federasi Pemuda Demokratik Sedunia
- Sosialisme demokratis
- Communist Party of Britain (Marxist–Leninist)
- Communist Party of Great Britain (Marxist–Leninist)
- Revolutionary Communist Party of Britain (Marxist–Leninist)
- Communist Workers League of Britain (Marxist–Leninist)
- Communist Party of Britain
- Communist Party of Great Britain (Provisional Central Committee)
- Communist Party of Canada (Marxist–Leninist)
- Revolutionary Marxist–Leninist League
- New Communist Party of Britain
- Communist League of Great Britain
