Questioner: Is it allowed to spy on people who want to harm the scholars or callers of the Ummah? In order to distance this harm from them, is it allowed to spy?
Al-Albaani: I think the question contradicts itself, how did this person who wants to spy come to know that there are people who want to harm the Ummah except by spying?
Questioner: [He and the others present start laughing].
Al-Hudaa wan-Noor, 674.