4:75

And what reason do you have not to fight in the cause of Allah, to rescue the helpless oppressed old men, women, and children who are crying: “Our Lord! Deliver us from this town whose people are oppressors; send us a protector by Your grace and send us a helper from Your presence?”
Meaning:-
Oppress: keep (someone) in subservience and hardship, especially by the unjust exercise of authority.