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Мамаев Сергей Олегович

Mamaev Sergei Olegovich was born on March 11, 1980, lived in the city of Yoshkar-Ola, Mari El Republic, civil activist.

He was sentenced to 2 years and 8 months in a penal colony under Part 2 of Article 282.2 of the Criminal Code of the Russian Federation ("Participation in the activities of a public association or other organisation in respect of which a court has made a decision that has entered into legal force to liquidate or prohibit activities in connection with the implementation of extremist activity") of supporting one of the organisations of Alexei Navalny's supporters.

Deprived of liberty since July 22, 2025.