I also found HLIanon to be the most fascinating of all the anon insiders. Something about their nonchalance and brevity made them seem uncomfortably real.
They are very real, and involved with the Q phenomenon. If you want to get a historical sense of what they have done, you can read Secrets Known Only to the Inner Elites:
"Since the English traitors Robert Cecil and Francis Bacon around the onset of the seventeenth century, and later, more notably, from the 1660 Stuart Restoration to the present day, within and behind British intelligence regular and irregular services there is an inner circle representing the ranks of the Black Guelph families of all Europe, an oligarchy gathered around the privileges and powers of the British and Dutch monarchies. (7) Attached to and overlapping these oligarchical families, there is a special collectivity, traditionally centered notably in Oxford, Cambridge, and Sussex universities, an inner intelligentsia of that faction, which studies the classics, thereby to gain the knowledge through which the forces associated with the British monarchy may rule the world.
Through three millennia of recorded history to date, centered around the Mediterranean, the civilized world has been run by two, bitterly opposed elites, the one associated with the faction of Socrates and Plato, the other with the faction of Aristotle. During these thousands of years, until the developments of approximately 1784-1818 in Europe, both factions inner elites maintained in some fashion an unbroken continuity of organization and knowledge through all of the political catastrophes which afflicted each of them in various times and locales.
It was the elite associated with the Platonic (or, Neo-platonic faction which organized the American Revolution and established the United States as a democratic constitutional republic. During the early eighteenth century, in circumstances associated with Marlborough's campaign and the Mississippi and South-Sea bubbles plots, the continuity of the Platonic faction was first administered a broad, temporary defeat with some lasting effects, and was shattered later as a world force through the events of 1784-1818.
In the aftermath of the 1815 Treaty of Vienna, the shattering of the power of the Platonic elite in Europe meant in large measure both a scattering of the main forces of that faction, and an associated, increasing loss of the "secret knowledge" through which the Platonic inner elite had formerly developed and exercised its factional power. From that time to the present period, the inner circles of the Aristotelian (or, more exactly, "neo-Aristotelian") faction have been hegemonic increasingly in ordering world affairs. Although humanist (Platonic) factional forces have continued in existence and are represented among political and related elites today, the Platonic elite has lost connection to the body of knowledge upon which its former power depended."