Translation of "snitch" into Basque

The Opus's control was brutal, brutal. At university assemblies, at the main entrance of the School of Architecture, members would stand around whoever was speaking, to cover them, in case a snitch was passing by, so they couldn't so easily find out who was speaking.

Opusen kontrola basatia zen, basatia. Unibertsitateko asanbladetan, Arkitektura Eskolaren sarrera nagusian, kideak hitz egiten ari zenaren inguruan jartzen ziren, estaltzeko, salatariren bat pasatzen bazen, ez zezan hain erraz jakin nor zen hizketan ari zena.