I would like to ask an important question. I am suspecting a brother to be a spy. There are many evidences which leads me and many others to this conclusion. Knowing the person, he seems to be a very pious person MAshaa'Allah. However, there were many matters in which he gave us an impression that he is a spy. Honestly, I am very confused. Am I aloud to suspect someone of being a spy? Am I aloud to warn others? What should I do in this case.