An oppressor is a person or group of people that is treating another person or group of people cruelly or unfairly. Lacking sovereignty, they could organise no defence against their oppressors. a person or group that treats people unfairly or cruelly, and prevents them from having the same rights that other people in society have
One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity