Yes Minister (1980)

S2E3 The Death List

Upon discovering that the secret service had been surveilling him during his time in the opposition, Jim resolves to introduce a bill aimed at limiting such surveillance. However, he soon realizes that he’s been targeted by a terrorist organization, placing him on their death list. To track down the culprits, he concludes that the only option is to monitor phone communications, setting off a dangerous game of cat and mouse.