- saboteur, wrecker, diversionist - someone who commits sabotage or deliberately causes wrecks
--1 is a kind of destroyer, ruiner, undoer, waster, uprooter
--1 has particulars: sleeper - fifth columnist, saboteur - a member of a clandestine subversive organization who tries to help a potential invader
--2 is a kind of traitor, treasonist
--2 is a member of fifth column, Trojan horse