Cheka FBI Gestapo Interpol MP MVD Mounties NKVD OGPU RCMP SP Scotland Yard bugging cloak-and-dagger work constabulary counterespionage counterintelligence county police electronic surveillance espial espionage following highway patrol intelligence intelligence work law enforcement agency military intelligence military police observation police police force political police posse provincial police riot police secret service security force shadowing shore patrol special police spying stakeout state police surveillance tactical police tailing trailing troopers vigilance committee vigilantes wiretap wiretapping