The Domestic Standing Army
For anyone interested in the problem of police militarization and its effects, Radley Balko of The Agitator blog has a handy-dandy running collection of news stories re police excess.
Read these true tales together with his Cato Institute article on the topic and David Codrea's priceless The Only Ones collection. You'll then have a pretty good idea of who is charged with defending the bureaucrats, politicians, and other statist swine from their subjects, the Great Unwashed.
Just for your information and education, of course.