Quote Originally Posted by Боб Уайтман View Post
And
гражданин! (citizen, to a man)
гражданка! (citizen, to a woman)
are used mainly by the police.
i agree with Bob only would add that a person may feel offended if you address him/her that way just because its customary for the laws, since just like in the USA in Russia and former USSR in general lots of people aren't very fond of law enforcement bodies