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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.

References in classic literature ?
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.
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.