 In 1937 Klychkov was arrested by NKVD and accused of being a Lev Kamenev's associate and a member of the anti-Soviet terrorist (and apparently fictional) organization called the Labour Peasant Party.He was executed on 8 October.In the 1990s the documents appeared which seemed to prove that on that day he was just shot dead by an NKVD officer during the interrogation in the Lefortovo Prison.