"They would send spies to listen and take revenge if someone spoke out of line," Hammad said.

Who knows if some spy is listening?

The really burning enthusiast never interrupts; he listens to the enemy's arguments as eagerly as a spy would listen to the enemy's arrangements.

"You know spies are listening to every word, don't you?"

'Hidden places where spies can lurk and listen.'

This effort was used to prevent people with sensitive information from talking about it where spies or saboteurs could listen in.

Mail was censored, and spies listened in on the few telephones there.

The Voerster's spies listened.

Well, if spies were listening in, then they knew all.

Nay, begin to think like John Common even now, for we never know when Alfar's spies may be listening.