"A nation can survive its fools, and even the ambitious. But it cannot survive treason from within. An enemy at the gates is less formidable, for he is known and carries his banner openly. He rots the soul of a nation, he works secretly and unknown in the night to undermine the pillars of the city, he infects the body politic so that it can no longer resist. A murderer is less to fear. The traitor is the plague." -Cicero
Muslim Brotherhood in America, Part 4: Suhail Khan, A Case Study in Influence Operations
If we are to understand the full nature of the threat posed by the likes of Suhail Khan, which is -- as Sun Tsu admonishes -- a prerequisite to counteracting that threat, we need to examine the Khan case study in closer detail.