On: The Disappearance of an Internet Domain

[aguaviva]

Seems they were referring to the "USSR Returns" subplot of Season 9, Episode 19:

https://en.wikipedia.org/wiki/Simpson_Tide

Ironically, there's some unintended truth in their reference (i.e. to all intents and purposes the KGB hasn't gone anywhere and basically is still around, just renamed/reorged) but that's an entirely different thread.