buy-and-bust operation 22 Associations

undercover operation (generic term)

clandestine 11 Associations

cloak-and-dagger hole-and-corner hugger-mugger hush-hush secret surreptitious undercover

cloak-and-dagger 16 Associations

clandestine hole-and-corner hugger-mugger hush-hush secret surreptitious undercover

counterspy 10 Associations

mole spy (generic term) undercover agent (generic term)

double agent 12 Associations

spy (generic term) undercover agent (generic term)

espionage 9 Associations

spying (generic term) undercover work (generic term)

espionage agent 15 Associations

spy (generic term) undercover agent (generic term)

foreign agent 13 Associations

spy (generic term) undercover agent (generic term)

hole-and-corner 15 Associations

clandestine cloak-and-dagger hugger-mugger hush-hush secret surreptitious undercover

hugger-mugger 13 Associations

clandestine cloak-and-dagger hole-and-corner hush-hush secret surreptitious undercover

hush-hush 9 Associations

clandestine cloak-and-dagger hole-and-corner hugger-mugger secret surreptitious undercover

infiltrator 11 Associations

spy (generic term) undercover agent (generic term)

margarete gertrud zelle 23 Associations

Mata Hari Margarete Gertrud Zelle spy (generic term) undercover agent (generic term)

mata hari 9 Associations

Mata Hari Margarete Gertrud Zelle spy (generic term) undercover agent (generic term)

mole 4 Associations

counterspy spy (generic term) undercover agent (generic term)

secret 6 Associations

clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush surreptitious undercover

sleeper 7 Associations

spy (generic term) undercover agent (generic term) saboteur (generic term) wrecker (generic term) diversionist (generic term) terrorist (generic term)

spy 3 Associations

undercover agent secret agent (generic term) intelligence officer (generic term) intelligence agent (generic term) operative (generic term)

spying 6 Associations

undercover work intelligence (generic term) intelligence activity (generic term) intelligence operation (generic term)

surreptitious 13 Associations

clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush secret undercover