 Complete the following phrase:  The issue of mass repressions was known to Soviet leaders well before the speech. The speech itself was prepared based on the results of a special party commission chairman Pyotr Pospelov, P. T. Komarov, Averky Aristov and Nikolai Shvernik, known as the Pospelov Commission, arranged at the session of the Presidium of the Party Central Committee on 31 January 1955. The direct goal of the commission was to investigate the repressions of the delegates of the 