It depends on how they re used. Intelligence and covert operations are a dark reality in our World. And has been for longer than people think. Each Civ can have their own agencies. America uses the CIA, England-Scotland Yard, Russia-KGB, etc. And each can have their own not so secret societies. That brings the Black Market into the game. Maybe this starts with Pirates. then evolves into Mafias and the Cosa Nostra. They can work hand in hand with Intelligence agencies for certain operations. Narcotics can be used as a Black market industry. These days it's called Black Ops. But it's been called many things throughout history. It's a dirty business. But very useful.Spies are already annoying enough without adding a UU spy!