How does a totalitarian government maintain power? ?

By restricting access to information other than government propaganda.

(Apex)

Totalitarianisms, or totalitarian regimes, are differentiated from other autocratic regimes because they are directed by a political party that pretends to be or behaves in practice as a single party and fuses with the institutions of the State. These regimes, in general, exalt the figure of a character who has an unlimited power that reaches all areas and manifests through the authority exercised hierarchically. They promote a mass movement in which it is intended to frame the whole society (with the purpose of forming a new person in a perfect society), and make intensive use of propaganda and different mechanisms of social control and repression such as the police secret