Secret society
A secret society is an organisation run in secrecy. There would be little or no physical evidence to prove that the society exists. An example of a large secret society is the Illuminati, which stopped existing in 1785 but is believed by some to still exist and be in control of large businesses, banks and individuals, but there is no evidence of this.
Secret Society Media
The Brethren of Purity were a secret society of Muslim philosophers in Basra, Iraq, in the 9th or 10th century CE.
A group of Thuggees strangling a traveller on a highway in India in the early 19th century.
