secret police 
noun [treated as plural]
A police force working in secret against a government’s political opponents.However, the new police lack any effective power against the Sandinista secret police or army....
- In places it was only Russian troops who protected the secret police from workers' anger.
- Ganev's career initially received a boost from his role as an official in the Stalinist secret police.
- color space
- color suite
- color symmetry
- color television
- color therapist
- color tone
- color top
- color transparency
- color-treat
- color-treated
- color triangle
- color twist
- color type
- color value
- color vision
- colorway
- color-weak
- color weakness
- color word
- coloss
- colossal
- colossalise
- colossality
- colossalize
- colossally