sub·ver·sive 
(səb-vûrsĭv, -zĭv)
(səb-vûrsĭv, -zĭv)adj.
Intending or intended to subvert an established order, especially to undermine or overthrow an established government: subversive groups; subversive publications.
n.
One who advocates or is regarded as advocating subversion.
sub·versive·ly adv.
sub·versive·ness n.