In 1985 a former KGB agent, Yuri Alexandrovich Bezmenov, went on TV to explain how America was being subverted from within. He outlined the KGB's four steps of Ideological Subversion.
These steps are:
In the video below he explains each, but I'd just like to point out that the first step was completed long ago. Demoralization - or getting people not to care about their country or to learn about it - has been ongoing in the school system at least since I was a child and probably much earlier. This entailed either not teaching kids about our civic system and how it was founded, to whitewashing it with stupid little idioms about who our founders were. Things like not explaining all that George Washington did, but merely pointing out that he had wooden false teeth or could not tell a lie and that he cut down the cherry tree and admitted it. How this has any bearing on Washington and the founding of our nation is beyond me. But ask the majority of Americans in this country and that's pretty much all they could tell you about Washington.
Bezmenov also points out how this brainwashing works to such an extent that people refuse to accept fact, logic or reason even when it is presented to them. This is quite obvious in this day and age. It can be most obviously seen in the recent global warming fiasco where there is plenty of evidence that man-caused global warming is so infantesimal that it has no negligible impact on the world. However, even after being presented with ClimateGate and the facts that scientists were covering up true data - and in cases outright lying about it - there are still people who are so brainwashed by the decades of things like recycling, "Earth Day" and An Inconvenient Truth that they refuse to believe the real truth.
The KGB knew that all of this works on human nature - that humans once having the same idea bombarded into their head by sources they trust, that they will tend to have a very hard time changing this belief even when presented with proof until their actual life is on the line and it is too late.
Yuri Alexandrovich Bezmenov on Ideological Subversion in America