Lots of things that went on undercover come out in the open.
Of course there were undercover agents on Zarathustra, hundreds of them.
Well, it's a combination of vice, narcotics, and undercover work.
The Foundation has to maintain its undercover status if it is going to accomplish anything.
At the same time rapid movement made considerable noise in the undercover.
Bradley, realizing that the clever little Hindu boy would be of great value in his undercover work, had hired him.
The Federation's undercover boys have been scanning the Devagas worlds and Tranest very closely of late, naturally.
He realized almost at once that such an unknown, undercover echelon would be a must.
We're fighting a battle against an unscrupulous enemy, an undercover battle, Steve.
Somebody was going to distinguish himself by catching Hoddan, and undercover politics worked to decide who it should be.