GCHQ intercepted foreign politicians' communications at G20 summits
This is precisely what the likes of GCHQ and the NSA are for.<p>I would imagine that any G20 host and it allies would use the opportunity to gather intelligence. I would also assume that where ever it is hosted, many intelligence agencies would be active.<p>If not, then what are these agencies for? They were never designed for crime fighting or mass surveillance of populations. There were and still are for spying on nations. G20 summits are a prime and legit target.<p>IMHO, this is a proper use of such agencies.