Bow Street runner
FBI
FBI agent
Federal
G-man
MP
Secret Service
Sherlock Holmes
T-man
bailiff
beadle
beagle
bear witness against
betray
betrayer
blab
blabber
blabberer
blabbermouth
blow the whistle
bound bailiff
captain
catchpole
chief of police
commissioner
constable
delator
deputy
deputy sheriff
detective
fed
federal
fink
flic
gendarme
government man
hotel detective
house detective
house dick
inform against
inform on
informer
inquiry agent
inspector
investigator
lictor
lieutenant
mace-bearer
marshal
mounted policeman
law officer
lawman
peace officer
Junker
Stones
anchorman
anchorwoman
atapril
bitther
business
creepin
diver/cameraman
dustup
ex-partner
facer
fleabag
goring
machine gun
pisspot
pokin'
rock-'n'-roll
slinking
things!
tie-ins
viewers'
vig
Ark
Clark
Clarke
Lark
Marc
Mark
Merc
Park
Sark
Spark
arc
ark
bark
dark
darke
demark
disembark
embark
hark
lark
marc
mark
marke
marque
merc
park
quark
question-mark
remark
sark
shark
spark
stark