His experiences during his Moscow stay, in the anxious atmosphere at the beginning of the "purges" and the trials of the Bolshevik leaders who opposed Joseph Stalin, made him keep a critical distance from the Soviet Union, without actually abandoning his Communist convictions.
Le sue esperienze durante il soggiorno moscovita, nella fase delle Grandi Purghe contro gli oppositori di Stalin, lo spinsero a mantenere una distanza critica dall'Unione Sovietica, senza abbandonare le sue convinzioni comuniste.