The demonstrators gathered around a monument to communist leader Vladimir Lenin and shouted slogans attacking President Vladimir Putin.
The elections on March 11 handed the Kremlin's supporters a hefty majority and squeezed out its most outspoken opponents.
The demonstrators in Russia's second city and Putin's hometown dispersed after about 90 minutes. Around 150 police looked over the rally.
(Reuters)
RFE/RL Russia Report
RFE/RL Russia Report