Define "extremist", suppress groups, UK

*[UK] ministers and officials to be banned from contact with groups labeled extremist.*

Aside from the general point that this would undermine democracy, there is the question of who to label as "extremist". What about the big Tory donor who recently said that MP Diane Abbot should be shot? I don't think you can get more extremist than that.

How about prohibiting ministers and officials from meeting with business lobbyists? Those are the most dangerous people for ministers to meet with.