Why did Sergeant Dignam provoke Billy Costigan so much in The Departed (2006)?

I mean both Colin and Sergeant Dignam attended an interview for a state trooper. But Sergeant Dignam provokes only Billy Costigan so much.

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    Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.
    – Paulie_D
    Commented Oct 4, 2021 at 8:47
  • 1
    Seems pretty straightforward as to what he is asking
    Commented Oct 4, 2021 at 18:51

1 Answer 1


Dignam (Wahlberg) and Sullivan (Damon) were both Staff Sergeants. Costigan (DiCaprio) was merely a Trooper. Why would Dignam provoke Sullivan? They're the same rank. Also, Dignam had to outwardly show a lack of favoritism to Costigan so that no one might guess that Costigan was the mole.

  • "outwardly show" To whom? People looking into the office? Commented Mar 2 at 7:32

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