Both Uses

persecution
in
The Scarlet Letter
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He was likewise a bitter persecutor; as witness the Quakers, who have remembered him in their histories, and relate an incident of his hard severity towards a woman of their sect, which will last longer, it is to be feared, than any record of his better deeds, although these were many.†
p. 11.2

persecutor = someone who treats others (or another) very badly and unfairly
His son, too, inherited the persecuting spirit, and made himself so conspicuous in the martyrdom of the witches, that their blood may fairly be said to have left a stain upon him.†
p. 11.3 *

persecuting = treating very badly and unfairly

Definitions:

(1) (persecution)
very bad and unfair treatment of others -- often because of race, religion, gender, sexual orientation, or political beliefs
(2) (meaning too rare to warrant focus)