Bolshevik leader Eduard Limonov and about 200 demonstrators were participating in Friday's March of the Dissenters in central Moscow when police arrived, saying the event was unauthorized, an unnamed source told ITAR-TASS.
Police arrested the 47 most active demonstrators, including Limonov, the source said.
Authorities told the Russian news agency the march had not been coordinated with Moscow's mayor and it conflicted with a youth sports festival already ongoing in Triumfalnaya Square.
ITAR-TASS said the demonstrators would be freed after administrative offense reports were filled out.
Video of Victoria’s Secret models trying to 'twerk' hits Instagram
Megyn Kelly: Santa Claus and Jesus are both white men