4
counterespionage
2
observation
2
secret police
2
secret service
2
shadowing
1
espionage
1
intelligence
1
bugging
1
spying
1
stakeout
1
surveillance
1
tailing
1
trailing
1
wiretap
1
wiretapping
0
censoring
0
censorship
0
cloak-and-dagger work
0
counter-espionage
0
electronic surveillance
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APASmart Define. (2015). counterintelligence thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/counterintelligence/thesaurus/synonyms
ChicagoSmart Define. 2015. "counterintelligence thesaurus" https://smartdefine.org/counterintelligence/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, counterintelligence thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/counterintelligence/thesaurus/synonyms>.
MLASmart Define. "counterintelligence thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/counterintelligence/thesaurus/synonyms>