Dignam:
[observing an exchange of microprocessors for money between Costello and Chinese triad members]
This is unbelievable. Who put the fuckin’ cameras in this place?
Police Camera Tech:
Who the fuck are you?
Dignam:
I’m the guy who does his job. You must be the other guy.

Den unge polisen Billy Costigan blir utvald att infiltrera gangstern Costellos liga. Samtidigt som Billy försöker få Costello att lita på honom gör en annan ung polis, Colin Sullivan, snabb karriär hos delstatspolisen.

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