The Monitors

Even after the set had been turned off, the T.V. blared the announcement: ' Citizens of Earth, I am Tersh Jetterax. It is my pleasure to announce to you that a new government has now taken over the conduct of all public affairs.' And thus the US was in the hands of the Monitors, the strangely polite yellow clad beings whose powers were such that they could render everyone helpless -- without shedding one drop of blood! Who were they? The Russkies? An alien race from another planet?