Back when the Punk Clan invaded the Alliance, it was still before World War II, meaning the Mother City influence hadn't invaded this planet yet.
Even so, the initial 'Punk Clan' still caught the attention of the Mother City, and even Ms. Deep Web (though it's unclear exactly which one) assisted the three major civilizations in suppressing this Civilization Poison Core from the shadows.
Later, the Mother City replaced the three major civilization forces and became the ruler of this planet. They remained quite wary of this ancient virus, splitting it into six parts, each entrusted to a different Inspector Department for safekeeping.
The part controlled by the Ghost in the Shell Mobile Division was sealed within the Shell Attack Center.
"I must remind you, you are about to open a Level 5 Dangerous Sealed Object; let me confirm once more if you wish to proceed?"
"Yes."
