He lived briefly in London in May 1908, where he used the British Museum library to write Materialism and Empirio-criticism, an attack on Bogdanov's relativist perspective, which he lambasted as a "bourgeois-reactionary falsehood". Increasing numbers of Bolsheviks, including close Lenin supporters Alexei Rykov and Lev Kamenev, were becoming angry with Lenin's factionalism. The Okhrana recognised Lenin's factionalist attitude and deemed it damaging to the RSDLP, thereby sending a spy, Roman Malinovsky, to become a vocal supporter and ally of Lenin within the party. It is possible that Lenin was aware of Malinowsky's allegiance, and used him to feed false information to the Okhrana, and many Bolsheviks had expressed their suspicions that he was a spy to Lenin. However, he informed Gorky many years later that "I never saw through that scoundrel Malinowsky."
