What is "wiretapping"

Usage examples of "wiretapping".

It involves arson, forgery, boobytrapping a car, wiretapping, theft, and secret communications between points widely separated, with coordinated criminal actions at each end-and it may involve doing in my cousin Zebulon.

Robert Farr, the noted electronic security expert, discusses wiretapping with infinity transmitters in his The Electronic Criminals, as noted in the reference list at the end of this novel.