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OPPRESSOR. One who having public authority uses it unlawfully to tyrannize over another; as, if he keep him in prison until he shall do something which he is not lawfully bound to do.
     2. To charge a magistrate with being an oppressor, is therefore actionable. Stark. Sland. 185.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
But whether the oppressor were overawed by the Gray Champion's look, or perceived his peril in the threatening attitude of the people, it is certain that he gave back, and ordered his soldiers to commence a slow and guarded retreat.
The people smiled mysteriously in the streets, and threw bold glances at their oppressors; while far and wide there was a subdued and silent agitation, as if the slightest signal would rouse the whole land from its sluggish despondency.
Dudley came behind, with a downcast look, dreading, as well he might, to meet the indignant gaze of the people, who beheld him, their only countryman by birth, among the oppressors of his native land.
Let us not insult the free and gallant citizens of America with the suspicion, that they would be less able to defend the rights of which they would be in actual possession, than the debased subjects of arbitrary power would be to rescue theirs from the hands of their oppressors. Let us rather no longer insult them with the supposition that they can ever reduce themselves to the necessity of making the experiment, by a blind and tame submission to the long train of insidious measures which must precede and produce it.
He imagined to himself vicious and unfortunate people whom he would assist by word and deed, imagined oppressors whose victims he would rescue.
Downplaying all the tools of control and cruelty, he shows that all the hues and cries of the oppressor are always followed by a command of silence.
He added, "People are free to vote, but remember that the oppressor will always remain an oppressor.
My approach to this topic is based primarily on the experience of fighting against apartheid in South Africa and in particular negotiations with the oppressor. The context is also one in which the engagement with the oppressor was about national liberation within South Africa.
ANKARA:Turkish President Recep Tayyip Erdogan on Sunday lambasted the Israeli prime minister as an oppressor" after he accused Turkey of massacres" against Kurds in a new war of words.
called names in the oppressor's language, covered in silt.
The organisation was based on Biko's understanding of the relationship between the oppressor and the oppressed.
In Martinique, a plantation slave makes his escape into the rain forest, only to be followed relentlessly by his oppressor. As the chase proceeds through the thick wilderness, the nature surrounding them begins to exert an ethereal power over the men, and their lives are radically changed.