subversive
sub-ver-sive
adjective
Tending to undermine or overthrow an established system, government, or authority.
"His art contained subversive political messages."
noun
A person who seeks to undermine or overthrow an established system or government.
"The government arrested several suspected subversives."
Thesaurus
Synonyms: revolutionary, revolutionist, subverter, seditious, insurgent, disloyal