A police officer checks the passport of a market trader of non-Slavic origin at Dorogomilovsky market in Moscow October 12, 2006. A Russian government crackdown on immigrants sent a chill last week through Moscow's food markets -- a focal point for the dark-skinned migrants from ex-Soviet states the Kremlin is targeting. Russian President Vladimir Putin last week ordered ministers to protect the "native population" from criminal groups "with an ethnic flavour" that control some markets. REUTERS/Dima Korotayev (RUSSIA)