An unpublished translation of my review for Gennadii Aleksandrovich Kurenkov, Ot konspiratsii k sekretnosti: zashchita partiino-gosudarstvennoi tainy v RKP(b)—VKP(b), 1918–1941 gg. [From conspiracy to secrecy: protecting party-state secrets at RKP(b)—VKP(b), 1918–1941] (Moscow: AIRO-XXI, 2015).
The original review in Russian was published in Istoricheskaia ekspertiza no. 2 (2017), 258–262.