 Pari gbolohun ti o tẹle: Pessi ṣe aṣoju SKP ni ọpọlọpọ awọn apejọ kariaye pataki ti iṣipopada komunisti agbaye; ni 19th 1952, : 22nd 1961 ati 23rd 1966 congress ti Communist Party of the Soviet Union, awọn 1957 ati 1960 International ipade ti Communist ati Awọn oṣiṣẹ Awọn ẹgbẹ ati awọn 50th aseye ti October Revolution. 