The prosecutor asked the Moscow City Court on July 7 to sentence two Russian opposition activists -- Sergei Udaltsov and Leonid Razvozzhayev -- to eight years in jail each.
Udaltsov, the coordinator of the Left Front movement, and Razvozzhayev are accused of preparing mass riots in Russian regions and organizing an anti-Putin rally on Moscow's Bolotnaya Square in May 2012 that turned violent and left scores of protesters and police injured.
Razvozzhayev is also accused of illegally crossing the border.
Investigators say the protest was orchestrated by a Georgian politician, Givi Targamadze, who is outside Russia.
The two went on trial in February and pleaded not guilty.
Eight participants in the Bolotnaya protest were sentenced to prison terms of between three and four years earlier this year.
Some of them were amnestied and released.