Being a spy, you must have a clear view of your
opponents and allies in the secret services community.
Spying is often referred to as the 2nd oldest occupation in the world. Knowing what the country's people are up to, can strengthen the government's power over them. Knowing what another country is up to can give you a significant edge in warfare and international affairs.
Information equals Power, hence the uprise of spies, organized in intelligence agencies.
The Intelligence Community consists of many agencies, some more important than others.