Definitions:

1. A member of a conspiracy. NOUN
   • The machinator carefully orchestrated the scandal to discredit his political opponents.
2. A person that is involved in unethical or nefarious activities designed to deceive others or manipulate outcomes for personal gain. NOUN
   • The machinator skillfuly manipulated the board members to secure his position as CEO.
3. Someone who engages in the act of plotting or sheming, usually in a way that is considered deceitful or dishonest. NOUN
   • The machinator behind the corporate takeover was eventually revealed to be a disgruntled former employee.

Synonyms:

• conniver
• conspirator
• manipulator
• plotter
• schemer