'Oppressor' in the Bible

My God, rescue me from the power of the wicked, from the hand of the cruel oppressor!

He shall judge the poor of the people, he shall save the children of the needy, and shall break in pieces the oppressor.

They remembered not his hand, the day when he delivered them from the oppressor,

And gave his strength into captivity, and his glory into the hand of the oppressor;

No enemy will be able to exact tribute from him; a violent oppressor will not be able to humiliate him.

Let the redeemed of Jehovah say so, whom he hath redeemed from the hand of the oppressor,