Totalitarian governments are often controlled by a single political party because

The party’s members can be counted on to follow the leader’s ideology, is the right answer.

Explanation:

The embodiment of totalitarianism can be observed in its very title; it is a kind of rule wherein the government maintains cumulative authority over on the society, including all parts of people in general and private existences of its residents. 

There are a few attributes that are basic to extremist systems, including: 

1. Single party rule. 

2. Complete military control.

3. Full control over the mean of communication (for example, papers, promulgation, and so on… ) 

4. Police control 

5. Control of the economy

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