I am a member of Republic.
Republic are a pressure group that wants to see an end to the Monarchy.
The Monarchy is an institution in the UK.
I will try ti undermine it.
That makes me an extremist.
Revealed: plan to brand anyone ‘undermining’ UK as extremist | UK security and counter-terrorism | The Guardian
Government officials have drawn up deeply controversial proposals to broaden the definition of extremism to include anyone who “undermines” the country’s institutions and its values, according to documents seen by the Observer.