subverter

/səbˈvɜrtər/
noun
  1. A person who tries to destroy or weaken an established system, government, or authority.
    • Historians view him as a subverter who helped bring down the old regime.
    • The dictator labeled all critics as subverters of the state.
    • The spy was known as a dangerous subverter of military secrets.
  2. A person who challenges or undermines accepted norms, values, or traditions.
    • The artist was a subverter of conventional painting styles.
    • She became a subverter of gender norms through her bold public speeches.
    • The writer was celebrated as a subverter of literary traditions.