the cia
cia
By the very nature of secretive spy agencies, I doubt if you will ever find a true answer to this.
The world's largest spy agency is the CIA which which gathers intelligence information about foreign governments.
I would think that it is self explanatory. A spy agency is an agency that is engaged in spying.
A spy gets paid by the people or agency that wants the information the spy is looking for. If it's a government agency, then the tax payers are paying the spy's salary. If it is an industrial spy looking for a company's secrets, then the corporation that hired the spy will pay the bill.
Central Intelligence Agency (CIA)
Worlds largest animal: Blue Whale
worlds largest producer of nickel
nsa
USA has the worlds largest rail network.
the worlds largest swamp is the Sudd thx for asking
Director D
James Bond