Around this time, when he was back in Russia, he joined the Russian Futurist group Centrifuge, also spelt Tsentrifuga, as a pianist; although poetry was just a hobby for him then, it was in their group journal, "Lirika", where some of his earliest poems were published. His involvement with the Futurist movement as a whole reached its peak when, in 1914, he published a satirical article in "Rukonog", which attacked the jealous leader of the "Mezzanine of Poetry", Vadim Shershenevich, who was criticizing "Lirika" and the Ego-Futurists because Shershenevich himself was barred from collaborating with Centrifuge, the reason being that he was such a talentless poet. The action eventually caused a verbal battle amongst several members of the groups, fighting for recognition as the first, truest Russian Futurists; these included the Cubo-Futurists, who were by that time already notorious for their scandalous behaviour. Pasternak's first and second books of poetry were published shortly after these events.