Sadoul and the remainder of the mission moved to Moscow on March 13. He witnessed there the start of the Left SR uprising, including Maria Spiridonova's call to terrorist action against the Commissars. By April 1918, Sadoul was frequenting the Moscow anarchists, praising their collectivism and squatting practices. He befriended their spokesman, Alexander Gay, who told him that Bolshevism was being infected by "impure and dangerous elements", and, Sadoul claims, plotted his very own anarchist revolt.