You should go to the source and read the third response from Sagan . He says a lot and makes things quite clear.

Plus, if that commentator had really seen Red Dawn, he would have known that the invaders were Russians who joined with unnamed Latin American countries.

This is all a continuous pattern of official and unofficial political intimidation that reaches back to the major tipping point: the years after World War II with "duck and cover" drills for nuclear war, the Red (Witch) Hunts and the suggestion to build small underground shelters stocked with food and supplies.

"Fear is the mind killer!"