I am not sure about that. I would definitely expect allies to keep tabs on each other for several reasons. I would not expect them to sell spying capabilities t

I am not sure about that. I would definitely expect allies to keep tabs on each other for several reasons. I would not expect them to sell spying capabilities that could be used against their allies to any dictator who comes asking, however. Or really compromise their infrastructure. Remember that the US did spy on several European heads of states a couple of years ago, including bugging their phones (or attempting to).