Some of them were printed in a ticker tape that ran across the screen. One suggested that all Chechens should be exterminated in their mothers' wombs. The notion of the collective responsibility of the peoples of the Caucasus for all that is wrong in Russia is deeply engrained in the popular psyche - and finds particularly unpleasant expression in the police force. In contravention of the Russian constitution, anyone visiting Moscow who is not a permanent resident of the city must get a permit, a requirement that the police are now using to crack down on Chechens and others. Hundreds of arrests are being made and many more being deported from Moscow.
Beatings are commonplace.
It is a symptom of so much else that is wrong in Russia. The concept of civil liberties is barely understood - let alone defended by the courts or the law enforcement bodies.