”Fuller knowledge of the organization which produced such terrible results served to increase rather than to lessen the horror which it inspired in the minds of men. None knew who belonged to this ruthless society. The names of the participators in the deeds of blood and violence done under the name of religion were kept profoundly secret. The very friend to whom you communicated your misgivings as to the Prophet and his mission, might be one of those who would come forth at night with fire and sword to exact a terrible reparation. Hence every man feared his neighbour, and none spoke of the things which were nearest his heart.”

Sir Arthur Conan Doyle, A Study in Scarlet (1887)