> That is certainly a clear headed and reasonable explanation of why it might be tabled as an option... but I can't fathom who thought deploying a nation state level intelligence agency (in a western democracy) against the communications infrastructure of political dissidents was proportionate. Or even a good idea.
Using special branch to infiltrate political groups is commonplace. So much so that there are recent scandals from officers living false lives having children with the people they are surveiling, and trials collapsing.
GCHQ have to obey the laws of England. They are usually mentioned in law to give specific exemptions.
I have no idea how they handle the laws of other nations. I'm guessing that they obey those laws where they align with English law.
It's not the first time they've done "script kiddie" antics. Hacking terrorist information websites to replace bomb making instructions with the recipe for cupcakes is another example.