There's quite a few of them
The UK terror watchlist is managed by MI5 and counter-terrorism police, tracking tens of thousands of individuals assessed for risks of re-engaging in or supporting extremist activity. For official data on banned groups, check the GOV.UK Proscribed Terrorist Groups List, and review threat definitions on the MI5 Threat Levels Page.Watchlist Scale and CompositionTotal Figures: Estimates indicate roughly 40,000 individuals are logged on intelligence databases where a risk of terrorist involvement or re-engagement has been identified
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