MOSCOW, February 9 (RAPSI) - Alexander Margolin who has served 3 years in prison for participation in the riots on Bolotnaya Square on May 6, 2012, has been released from prison, his attorney Sergei Panchenko told RAPSI on Tuesday.

Earlier, a court in the Ryazan Region granted parole for Margolin.

Over 400 people were arrested and scores were injured in the authorized Bolotnaya Square protest that turned violent in May 2012. Dozens were later charged with inciting mass riots and battery against law enforcement officers.

Riot organizers Leonid Razvozzhayev and Sergei Udaltsov were sentenced to 4.5 years in prison each.

Other defendants in the case received prison terms ranging from suspended sentences to four years. Several defendants were pardoned; one is undergoing compulsory mental treatment.

Margolin was sentenced to 3.5 years in prison.