独裁者は

the dictator

→ 独裁者
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the dictator 独裁者 means “dictator,” and は marks it as the topic of the sentence. The topic marker is often translated naturally as “the” in this context.
JA: 独裁者は国民の自由を奪った。
EN: The dictator took away the people's freedom.

独裁者はその厄介な状況対処しようとしたどうにもならなかった

The dictator tried to deal with the difficult situation, but there was nothing he could do.

悪名高い独裁者は思う存分特権乱用した

The infamous dictator abused his privileges to his heart’s content.

その独裁者は人々に満足できなかった

The dictator couldn't be satisfied with the people.

その独裁者は思う存分特権乱用した

That dictator abused his privileges to his heart’s content.