What is totalitarian propaganda and how can it control
enlightened people

Totalitarian Propaganda can controlled well educated people by conveying the regimes beliefs, almost forcing it down their subjects throats.

So when it works it usually shows an "Evil" or "Enemy" of the state, and obviously without proper methods of evaluating the truth decent people will believe it for example look at the DPRK or Iran.

answer: do

the 'italicized phrase' is a noun clause that is used as a direct object.