Demonstrators are targeting what they call rampant corruption and a Kremlin crackdown on democratic freedoms.
Authorities have refused to allow opposition groups to march through the city center, and have given permission only for two separate protests.
Protest organizers, led by former chess champion Garry Kasparov, say they won't try to stage a march but that police can not stop people moving from one protest to another.
Police this week raided the offices of Kasparov's United Civic Front, saying they were looking for "extremist literature."
(AFP, ITAR-TASS, Reuters)
Demonstrators in Moscow carry a coffin with a television in it to protest government control over broadcasting (TASS file photo)
DO RUSSIANS LIKE THEIR GOVERNMENT? During a briefing at RFE/RL's Washington office on November 15, Richard Rose, director of the Center for the Study of Public Policy at the University of Aberdeen, discussed the results of 14 surveys he has conducted since 1992 on Russian public opinion about democracy and the country's development. He discussed the implications of these opinions for relations with the West and for Russia's 2008 presidential election.
LISTENListen to the complete discussion (about 42 minutes):
Real Audio Windows Media
ARCHIVEAll of RFE/RL's English-language coverage of Russia.
UPDATED CONSTANTLY: Visit RFE/RL's Russian-language website, featuring news, analysis, features, streaming audio, and more, in Russian, from RFE/RL's Russian Service.