saboteur
UK: ˌsæbəˈtɜː(r) | US: ˌsæbəˈtɜːr
n. a person who deliberately destroys or damages property or obstructs operations, especially for political or military advantage.
n. someone who intentionally undermines a process or activity.
The word "saboteur" originates from French, derived from "sabot" (a wooden shoe). Historically, disgruntled workers would throw their wooden shoes ("sabots") into machinery to disrupt production, giving rise to the term. The suffix "-eur" (equivalent to English "-er") denotes a person who performs the action, thus "saboteur" literally means "one who sabotages." The term evolved to describe anyone who deliberately causes disruption, especially in political or industrial contexts.
The factory suspected a saboteur had tampered with the assembly line.
During the war, enemy saboteurs infiltrated the supply depot.
She was accused of being a saboteur for leaking confidential documents.
The protestors were labeled as saboteurs by the government.
Cybersecurity experts detected a saboteur attempting to crash the network.