It is reported that while in opposition, he was subjected to covert surveillance, including phone tapping.

What are my legal rights if I'm under covert surveillance?

Sometimes, however, covert surveillance has to be done by a man and not a machine.

Her behavior makes him suspicious and he orders covert surveillance of her at all times.

He moves on to covert surveillance, which he says "was a very dangerous job".

The police have said little about the current extent of covert surveillance here.

For a chief investigator, she did a lousy job of covert surveillance.

As to the right of privacy, covert surveillance remains the major concern.

She said we must be careful because the asteroid was probably under covert surveillance.

And it was possible that Lane's guys already had covert surveillance going.