'Oppression' in the Bible

I say to God my rock, 'Why hast Thou forgotten me? Why go I mourning in the oppression of an enemy?

For thou art the God of my strength. Why hast Thou cast me off? Why mourning do I go up and down, In the oppression of an enemy?

Why Thy face hidest Thou? Thou forgettest our afflictions and our oppression,

Because of the voice of an enemy, Because of the oppression of the wicked, For they cause sorrow to move against me, And in anger they hate me.

Trust not in oppression, And in robbery become not vain, Wealth -- when it increaseth -- set not the heart.

They do corruptly, And they speak in the wickedness of oppression, From on high they speak.

Ransom me from the oppression of man, And I observe Thy precepts,