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That should get the rats scurrying... (13.36)

Bobby: Everyone here is on notice. Everything you do will be picked apart until I discover who is on the level and who's a fucking quisling!…

That should get the rat scurrying.

Mafee: What the fuck is a quisling?

Donnie: Turncoat.

Mafee: Shit! I knew it didn't sound good.

"Quisling" is a term originating in Norway, which is used in Scandinavian languages and in English for a person who collaborates with an enemy occupying force – or more generally as a synonym for traitor. The word originates from the surname of the Norwegian war-time leader Vidkun Quisling, who headed a domestic Nazi collaborationist regime during World War II.