For a society striking a British balance between security and privacy, I'd say it's fair to require people with violent convictions to (a) register public protests they plan to attend and (b) consent to facial-recognition surveillance in public. (One could hash, locally store and potentially hardware enforce the restriction on the device level.)
That doesn't mean I think it's okay for everyone around him to have to give up those rights. And I wouldn't support even that in America unless the individual is on probation.
There's a reason you choose to do this during a political protest.
Also, you included a bunch of gambling and tax debts for some reason? Do you think that they are justified because he, and the people who join him, will be publicly avoiding taxes and bookies?
edit: It's also important to note that in the 15th year of future Reform rule, when a "reformed" Tommy Robinson is appointed Home Secretary, he will entirely support drones doing facial recognition during protests. How else are you supposed to catch the anti-Semites?
Sure. But this isn't an absolute right. To be trivial, you don't have the right to do fraud in public without being recorded by the police.
I'm saying for a convicted violent criminal, particularly one with a history of inciting violence, I think there is a place where a reasonable line could exist.
> you included a bunch of gambling and tax debts
Where did I do this?