According to investigations of the Russian opposition group "Memorial", the lists of convicted were not managed by Special Sector of Central Committee. The "Memorial" Group says that
Nikolai Yezhov personally visited all members of the
Politburo to get their endorsement of the lists of convicted. Nikolaevsky suggested that Poskrebyshev had been responsible for "liaison with Stalin and supervising the removal of top figures whom Stalin, for one reason or another, did not want openly arrested", and for "surveillance of the Party Secretariat"; At this time Poskrebyshev, much like other prominent members of the Communist Party (for example,
Vyacheslav Molotov and
Mikhail Kalinin) was not able to help his wife. She was accused by
Lavrenty Beria of counter-revolutionary liaisons with Leon Trotsky, and was executed in 1941. Such cases are unlikely to have arisen in the case of individuals who were playing a leading role in the conduct of the purges. In contrast, the leading role of Beria in the purges is more evident. The arrest of Poskrebyshev's wife might have allowed him to remove Poskrebyshev from Stalin's inner circle and replace him with an individual controlled by Beria. In this scenario the next step would have been total control of Stalin by Beria. Poskrebyshev was not an ally of
Nikolai Yezhov but some collaborative government business was to be expected due to the membership of Nikolai Yezhov in the Secretariat of the Central Committee. Probably he had garnered the animosity of Beria by spearheading corruption investigations in the
Georgian apparatus of the NKVD—then controlled by Beria—in 1938. The involvement of Poskrebyshev in the prosecution of Party officials was assumed by Parrish based on case of M.P. Mager. "On 6 June 1941, Poskrebyshev wrote a report to the Central Committee
indicting M. P. Mager, the Chief of Staff of the
Leningrad Military District, who had already been arrested once in 1938." However, the role of Poskrebyshev in this case is not clear. According to records of commission of Presidium of Central Committee of Communist Party Mager was arrested under resolution of the Ministry of Defense of the USSR, affirmed by
Semyon Timoshenko (March 1941). He was accused of military conspiracy against the Soviet Union. On 15 May 1941, he wrote a letter to Stalin with a statement of his innocence. On June 6, 1941, the letter was directed to the attention of Poskrebyshev and most probably delivered to Stalin. However, in spite of this, on 20 July 1941, the
Supreme Military Court of USSR did make a decision regarding the Mager case: the death sentence (he was rehabilitated in 1955). Noticeably, Alexander N. Poskrebyshev did help many artists and scientists of USSR to avoid being purged or executed. ==Eradication of cosmopolitanism==