1) Agent 2) Criminal 3) Culprit 4) Doer 5) Offender 1) Culprit 2) Offender 3) Wrongdoer 
• (n.) One who perpetrates; esp., one who commits an offense or crime.
Someone who has committed a crime or a harmful action.
Per'pe·tra`tor noun [ Latin ] One who perpetrates; esp., one who commits an offense or crime. 
[n] - someone who perpetrates wrongdoing
perpetrator 1. A term commonly used by law enforcement officers to designate a person who actually commits a crime. 2. A person who commits a crime or some other harmful act. 3. Someone who produces, performs, or executes something like a crime. 4. Etymology: 'Perpetrator' is from 1570, from Late Latin perpetrator, from Latin perpetrare; a deriv...
A person committing crimes against individuals/groups.
culprit noun someone who perpetrates wrongdoing