From this I would deduce that control of the education system is imperative to overthrow a free people.
"When [the moral sense] is wanting, we endeavor to supply the defect by education, by appeals to reason and calculation, by presenting to the being so unhappily conformed, other motives to do good and to eschew evil, such as the love, or the hatred, or the rejection of those among whom he lives, and whose society is necessary to his happiness and even existence; demonstrations by sound calculation that honesty promotes interest in the long run; the rewards and penalties established by the laws; and ultimately the prospects of a future state of retribution for the evil as well as the good done while here.
These are the correctives which are supplied by education, and which exercise the functions of the moralist, the preacher, and legislator; and they lead into a course of correct action all those whose depravity is not too profound to be eradicated." --Thomas Jefferson to Thomas Law, 1814. ME 14:142