Is Vigilante Justice Or Extra Judicial Support Permissible?
Secret agencies that punish or kill people without due process are not permissible by Islam. Such agencies can and do undermine justice, which is absolutely wrong in the light of the Quran. Please see the following response for reference: Discussion 36371 • Reply 36376
The state or anyone else has no right to invade into personal privacy or personal domains of individuals. They can act only if there is a complaint e g a wife files a complaint about her husband. The role of the state secret agencies is confined to find the truth to investigate crimes or manage risks of criminal activities by monitoring suspects. In what circumstances they can hack personal privacy and whether such invasions require a court approval or not should be clearly specified in the law made by elected represented of the people of the state. However the secret agencies cannot punish anyone. It has to be thru the courts.