The Home Office is drawing up a blacklist of extremist individuals and organisations with whom the government and public sector should not engage, Theresa May has revealed.

The list of legal but unacceptable organisations is being compiled by a new Home Office "extremism analysis unit", which is also to develop a counter-entryism strategy to tackle Islamist radicalisation and ensure there is no repeat of the Trojan horse affair in Birmingham schools across the public sector.

In a speech outlining a wishlist of measures and powers to tackle extremism in Britain, the home secretary acknowledged that the work of the new unit had received only cabinet approval so far.

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