There isn't a direct noun form of "persecute".
However, you can use these related nouns to describe the act of persecuting:
* Persecution: This is the most common noun form and refers to the act of harassing or oppressing someone because of their beliefs, race, or other factors.
* Oppression: This is a broader term that describes the cruel or unjust treatment of people, often with the aim of suppressing them.
* Harassment: This refers to repeated, unwelcome behavior that is intended to annoy, alarm, or intimidate someone.
* Martyrdom: This specifically refers to suffering for one's beliefs, often death.
* Tyranny: This describes cruel and oppressive government or rule.
The best noun to use depends on the specific context.