Sergei Udaltsov

Sergei Stanislavovich Udaltsov (; born 16 February 1977) is a Russian left-wing political activist. He is the unofficial leader of the Vanguard of Red Youth (AKM). In 2011 and 2012, he helped lead a series of protests against Vladimir Putin. In 2014 he was sentenced to 4¹⁄₂ years in a penal camp for organizing the May 2012 protest which ended in violence between the police and demonstrators. Provided by Wikipedia