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Proscription under the Terrorism Act 2000

This paper describes the recent history and present status of proscribed organisations under the Terrorism Act 2000 (the “2000 Act”).

Prior to the 2000 Act, proscription was exclusively concerned with terrorism connected with the affairs of Northern Ireland. Under the 2000 Act, proscription was extended to include organisations concerned with both domestic and international terrorism.

The Home Secretary may proscribe an organisation if they believe it is “concerned in terrorism”. If the Home Secretary believes that an organisation meets this statutory test, they must then decide whether to proscribe the organisation. In doing so, they must take into account various policy considerations.

Consequences of proscription

The 2000 Act sets out a number of proscription offences. These include belonging to or inviting support for a proscribed organisation; arranging or assisting with the arrangement of a meeting that supports a proscribed organisation; addressing such a meeting; or wearing clothing or displaying articles in public which arouse suspicion of membership or support of a proscribed organisation.

It is also possible to impose financial sanctions on proscribed organisations.

Current proscribed organisations

As of August 2021 there are 77 international terrorist groups proscribed under the Terrorism Act 2000 and 14 organisations in Northern Ireland proscribed under previous legislation.

Since the beginning of 2020, four organisations have been newly proscribed, all of which share an extreme right wing or white supremacist ideology.

In January 2021, the House of Lords International Relations and Defence Committee recommended that the Government urgently review the status of an affiliate of Daesh/ ISIS operating in Afghanistan, the Islamic State Khorasan Province (ISKP). The Committee noted that the UK was the only member of the ‘Five Eyes’ group (an intelligence sharing network consisting of the UK, USA, Canada, Australia and New Zealand) not to have proscribed it.

In response, the Government told the Committee that as an affiliate of Daesh/ ISIS, ISPK “is effectively regarded and treated as being proscribed”.

The Annex to this paper includes a current list of proscribed organisations and a description of their activities.

Criticisms of the proscription regime

Whilst proscription has been posited as a powerful deterrent, a way of tackling lower-level support for terrorism, and a signal of rejection by society, questions have been raised as to its utility in combating terrorism and its compatibility with the rule of law.

The former Independent Reviewer of Terrorism Legislation (IRTL), Lord David Anderson QC, repeatedly recommended the introduction of time limits for proscription orders, as have his successors, Max Hill QC and the current IPTL, Jonathan Hall QC. However, the government has thus far declined to follow these recommendations and currently deproscription is done by way of application only. As a consequence, groups that no longer meet the statutory requirements for proscription continue to be proscribed, a situation described by Lord Anderson as “an affront to the rule of law”.


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