wiretapping

/W AY1 ER0 T AE0 P IH0 NG/
verb
  1. 1

    To install or to use such a connection.

noun
  1. 1

    The installation or monitoring of wiretaps.

Source: https://en.wiktionary.org/wiki/wiretap, https://en.wiktionary.org/wiki/wiretapping