fifth column

traitor

One who betrays allegiance

• quislingTreasonous occupation collaborator
• turncoatOne who betrays allegiance
• collaboratorOne who works jointly

defector · betrayer · treason · sedition · disloyalty · perfidy · double-cross · backstabber · sellout · rat

occupation

One's regular paid work

• resistanceCapacity to withstand force
• partisansStaunch factional supporters
• undergroundBelow ground or countercultural

Franco · Spanish Civil War · Nazi · Vichy · collaborationist · fascist · loyalist · nationalist · wartime · homefront

spy

Covert information gatherer

• moleSubterranean insectivore
• sleeperOne at rest
• infiltratorOne who enters covertly

agent · handler · asset · counterintelligence · covert · clandestine · undercover · surveillance · dead-drop · cipher

sabotage

Deliberate disruption of operations

• underminingWeakening by covert means
• destabilizationCausing loss of stability
• insurgencyArmed uprising against authority

sedition · coup · subterfuge · disruption · agitation · insurrection · conspiracy · collusion · dissent · rebellion

disinformation

Intentional deceptive falsehoods

• misinformationFalse data spread unintentionally
• psyopsStrategic manipulation of adversaries' thinking
• agitpropPolitical art for causes

brainwashing · indoctrination · manipulation · demoralization · fabrication · spin · deception · false-flag · leafleting · rumor

• resistanceresistance, defiance, resistance fighters, civil resistance, resist
• Traitorstraitor, turncoat, betrayer, Judas, Benedict Arnold
• dirty tacticsdirty trick, dirty tricks, dirty pool, foul play, cheap shot
• factionsfactions, faction, splinter groups, splinter party, blocs
• political intrigueintrigue, conspiracy, treason, plot, collusion
• secret organizationscabal, secret society, secret societies, conspiracy, spy network