Is it permissible for people to kill sorcerers if the authorities do not take action against them?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: There is a man in our village, outside the Kingdom, who harms people with sorcery, and the authorities do not take action against people like him. Is it permissible for us to kill him and save the people from his evil?

Answer:
But refute him and nullify, nullify his sorcery and his schemes, and warn the people against him. As for killing, that is for the authority. If you killed him, there would be fitnah (trial, discord or temptation) and blood would be shed. Perhaps his supporters and followers would rise up and cause fitnah. Yes. So whoever cannot do so, let him do it with his tongue. Deny it with the tongue. Explain and warn against him. Yes.