In 2012, he was accused of trying to organize riots in Russia for the money of fugitive oligarchs.

The coordinator of the opposition movement “Left Front” Sergey Udaltsov was released from the Tambov colony. The activist served the conclusion last 4.5 years, which he received in 2012 for organizing riots at the protest campaign on May 6. The liberation of the opposition was confirmed by his lawyer Violett Volkov.
Wife Udaltsova Anastasia said that he was initially released on August 9. The fact that this information turned out to be inaccurate, the associates of the activist found out "shortly before the release." Udaltsova added that on August 10, a press conference of the coordinator of the “Left Front” was planned.
The politician Alexei Navalny congratulated with the liberation from the prison “in the fabricated political case”, who had previously refrained from comments on the activist’s case.
On October 5, 2012, the NTV channel released the second series of the documentary “Anatomy of Protest”. It said that Sergei Udaltsov became “one of the performers of the power scenario” of Russian protests, and his actions were coordinated by the head of the Georgian Parliament Committee on Defense and Security Givi Targamadze with the support of fugitive Russian oligarchs.
On October 17, 2012, against Sergey Udaltsov and assistant deputy Ilya Ponomarev Leonid Razvoszhaev opened a criminal case on the preparation of riots. In July 2014, the court sentenced opposition to 4.5 years in prison in a general regime colony. The state prosecution then asked to appoint a term of 8 years of imprisonment.
Razvoszhaev went out of imprisonment in the colony on July 7. Then he stated that he was going to engage in "restoration of health", and subsequently would like to "promote the democratization of society and achieve social justice."