UK effectively bans Iran's IRGC as national security threat

What Happened

The UK Home Secretary Shabana Mahmood announced on Monday that the Islamic Revolutionary Guard Corps (IRGC) will be designated as a threat to national security under the newly enacted National Security (State Threats) Act. The legislation makes supporting the IRGC—ranging from expressing a positive opinion to providing material assistance—a criminal offence punishable by up to 14 years in prison. The prohibition applies only to IRGC activity deemed prejudicial to the UK, not to its domestic functions within Iran. The UK is also using the same act to target the allegedly Iran-linked Harakat Ashab al-Yamin al-Islamiya (Hayi) and the volunteer wing of Russia’s GRU military intelligence agency. Prime Minister Keir Starmer, who fast-tracked the bill in April, stated the powers would prevent Britain from being ‘a playground for states who want to spread fear, division and violence’.

Key Actors

Why It Matters

The move represents a significant escalation in the UK’s posture toward Iran, short of a full proscription of the IRGC, which international law prevents against a state entity. It aligns the UK more closely with US and Israeli pressure campaigns against Iran’s military and proxy networks, while also raising concerns about diplomatic backlash from Tehran. Civil liberties advocates warn that the law’s ambiguous wording could criminalise legitimate contact by journalists and NGOs with the IRGC, despite a ‘reasonable excuse’ defence. The designation also comes alongside £335m in funding for Jewish community policing, linking the IRGC and allied groups to domestic security threats.

Watch For

The laying of draft proscription regulations before Parliament and any parliamentary debate or amendment. Possible legal challenges over the scope of the ‘support’ offence and the interpretation of the ‘reasonable excuse’ defence. Iran’s diplomatic response, including potential retaliation against UK interests. Monitoring whether UK-based Iranian dissidents, journalists, or researchers face investigation under the new provisions. Any specific prosecutions or arrests tied to IRGC support.