autorytarny in English:

One of the band members was very authoritarian and the rest couldn't stand him any longer.

an authoritarian regime/government/ruler

The lives of the citizens were strictly controlled by an authoritarian regime.

A government who is more concerned with having people obey laws than in people having some freedom is an example of an authoritarian government

Must' sounds authoritarian, and people are choosing to express obligation – or having a duty to do something – in different ways.

In my analysis I rely considerably on the types of authoritarian behaviour first analyzed by Kurz.