There is already a group on Earth that marks their forehead with the symbol of 666 (that symbol is a book with 6666 paragraphs and the "mark" is obtained by bowing so low either to the book or by the authority of the book so often that a permanent contusion or scar emerges on their foreheads); more precisely, only the most "holy" of that group earn the mark. Those few "holy" leaders hold authority over neighborhoods, towns, and even whole regions already today. In some cases, those local leaders even do all of the buying and selling for their group in their area.
This group also has yet another interesting attribute: it lies profusely to its naive believers.
That happens to me at work - I have QWERTY spelled backward on my forehead from falling asleep on the keyboard.
More seriously, can this group you describe be referenced somewhere? Obviously it's not the best-kept-secret group. Do they have a web page? Secret handshake? Are they the Sunshine Carpet Cleaners?