yanner39
Emperor
Having a security bureau has the same effect as having a sleeping spy in a city - they don't stack. There's no other passive defense, but the most efficient espionage defense is the counterespionage mission in enemy cities.
So the spy is still "protecting" the city from espionage if it's "sleeping"? Sorry if this is a stupid question but I always leave them in a city and every turn, click on "skip" turn for each spy. It gets pretty long when you have 8 or 9 spies.