General Synonyms:
* Tyranny
* Subjugation
* Suppression
* Persecution
* Exploitation
* Brutality
* Injustice
* Domination
* Enslavement
* Bondage
* Servitude
Synonyms Emphasizing Specific Aspects:
* Political: Autocracy, totalitarianism, authoritarianism
* Social: Discrimination, prejudice, marginalization, inequality
* Economic: Exploitation, impoverishment, exploitation
* Psychological: Intimidation, manipulation, coercion
The best synonym to use will depend on the specific context of your writing or speech.