the secret police

:  kept from knowledge or view :  hidden

:  marked by the habit of discretion :  closemouthed

:  working with hidden aims or methods :  undercover

:  something kept hidden or unexplained :  mystery

:  something kept from the knowledge of others or shared only confidentially with a few

:  a method, formula, or process used in an art or operation and divulged only to those of one's own company or craft :  trade secret

:  govern

:  to control, regulate, or keep in order by use of police

:  to make clean and put in order

:  the internal organization or regulation of a political unit through exercise of governmental powers especially with respect to general comfort, health, morals, safety, or prosperity

:  control and regulation of affairs affecting the general order and welfare of any unit or area

:  the system of laws for effecting such control