Domestic Extremism Lexicon

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The Domestic Extremism Lexicon is a reference aid released by the United States Department of Homeland Security (DHS) that defines different classifications of extremists.

The document was released on March 26, 2009.

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Extremism is "the quality or state of being extreme" or "the advocacy of extreme measures or views".

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The National Extremism Tactical Co-ordination Unit (NETCU) was a British police organisation funded by, and reporting to, the Association of Chief Police Officers (ACPO) that coordinated police action against groups in the United Kingdom it described as extremist.

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The National Public Order Intelligence Unit (NPOIU) was run by the Association of Chief Police Officers (ACPO), a private company connected to United Kingdom police intelligence, and was set up in 1999 to track green activists and public demonstrations. There are links between NPOIU, ACPO, National Domestic Extremism Unit (NDEU), National Extremism Tactical Co-ordination Unit (NETCU) and the Welsh Extremism and Counter Terrorism Unit (WECTU).

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The National Domestic Extremism Team (NDET) was a police unit set up in 2005 within the association of Chief Police Officers to provide a dedicated response to tackling extremism. This team co-ordinates operations and investigations nationally, working closely in England and Wales with the Crown Prosecution Service which has set up a complementary network of prosecutors with specialist expertise in domestic extremism.

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Jihadist extremism in the United States refers to Islamic extremism occurring within the United States. Islamic extremism is adherence to a fundamentalist interpretation of Islam, potentially including the promotion of violence to achieve political goals. In the aftermath of the September 11, 2001 terror attacks, Islamic extremism became a prioritized national security concern of the United States government and a focus by many subsidiary security and law enforcement entities. Initially, the focus of concern was on foreign terrorist groups, particularly al-Qaeda, but in the course of the years since 9/11 the focus has shifted more towards Islamic extremism within the United States. The number of American citizens or long-term residents involved in extremist activity is small, but nevertheless is a national security concern.

Violent extremism is a form of extremism that condones and enacts violence with ideological or deliberate intent, such as religious or political violence. Violent extremist views can manifest in connection with a range of issues, including politics, religion and gender relations. Though "radicalization" is a contested term, its general use has come to regard the process by which an individual or group adopts violence as a desirable and legitimate means of action. Extremist thought that does not condone the exercise of violence may be accepted within society, and be promoted by groups working within the boundaries of legally permitted activity. The term "violent extremism" may also occur as a code name for Islamic terrorism.

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The Countering Violent Extremism Task Force (CVE), was a US government program established under the Obama administration to counter all violent ideologies, held by groups or individuals in the US, by engaging communities in the counterterrorism effort and by education programs or counter-messaging. The program worked with community groups such as local governments, police departments, universities, and non-profits. In 2019, the Office of Targeted Violence and Terrorism Prevention (TVTP) was established as a rebranding of the Obama-era initiative.

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