infiltrator
Noun
Meaning
an intruder (as troops) with hostile intent
someone who takes up a position surreptitiously for the purpose of espionage
Source: WordNetSynonyms
informer
percolator
plant
mole
spook
prowler
warrior
spy
operative
insider
informant
intruder
aggressor
invader
squealer
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Antonyms
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Examples
Singer James Murphy was marked by certain Banshees albums during his childhood. citation His band LCD Soundsystem covered " Slowdive " as a B-side to the single " Disco Infiltrator ".