On 26 August, the House of Commons Library published a new briefing note on the recent history and present status of proscribed organisations under the Terrorism Act 2000. 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 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.
https://researchbriefings.files.parliament.uk/documents/SN00815/SN00815.pdf
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