Cerberus

Cerberus is a human-survivalist organization, working only for the benefit of humankind it is known to disrupt other races relations and cause terror amongst them, even Humans.

Cerberus was formed a year after the First Contact War on the behalf of The Illusive Man, claiming that The Alliance would take no steps to punish the council for what they did, requesting that they should receive more benefits from the war.

Cerberus was confirmed a terrorist organization by The Alliance after exploding one of their reactors at Grettchen, causing a widespread airborne disease to break out and spread, killing hundreds of Humans.

Later Cerberus was confirmed a terrorist organization by the citadel council after destroying a passing ship, requesting that they take the supplies and ship for themselves.

Their strange iconic leader, The Illusive Man is a quiet shady figure, who associates with no one else but himself, no-one has ever met him in person, his identity completely unknown.