Here, Lenin revived his polemics against the Mensheviks, who objected to his advocacy of violent expropriations and thefts such as the 1907 Tiflis bank robbery, which the Bolsheviks were using to fund their activities. Lenin also became heavily critical of Bogdanov and his supporters; Bogdanov believed that a socialist-oriented culture had to be developed among Russia's proletariat for them to become a successful revolutionary vehicle, whereas Lenin favoured a vanguard of socialist intelligentsia who could lead the working-classes in revolution. Furthermore, Bogdanov – influenced by Ernest Mach – believed that all concepts of the world were relative, whereas Lenin stuck to the orthodox Marxist view that there was an objective reality to the world, independent of human observation. Although Bogdanov and Lenin went on a holiday together to Gorky's villa in Capri, Italy, in April 1908, on returning to Paris, Lenin encouraged a split within the Bolshevik faction between his and Bogdanov's followers, accusing the latter of deviating from Marxism.