When Vladimir Lenin returned to Russia on 3rd April, 1917, he announced what became known as the April Theses. Lenin attacked Bolsheviks for supporting the Provisional Government. Instead, he argued, revolutionaries should be telling the people of Russia that they should take over the control of the country. In his speech, Lenin urged the peasants to take the land from the rich landlords and the industrial workers to seize the factories.
Lenin accused those Bolsheviks who were still supporting the Provisional Government of betraying socialism and suggested that they should leave the party. Some took Lenin's advice, arguing that any attempt at revolution at this stage was bound to fail and would lead to another repressive, authoritarian Russian government.
Lev Kamenev led the opposition to Lenin's call for the overthrow of the government. In Pravda he disputed Lenin's assumption that the bourgeois democratic revolution has ended," and warned against utopianism that would transform the "party of the revolutionary masses of the proletariat" into "a group of communist propagandists." A meeting of the Petrograd Bolshevik Committee the day after the April Theses appeared voted 13 to 2 to reject Lenin's position.
Joseph Stalin was in a difficult position. As one of the editors of Pravda, he was aware that he was being held partly responsible for what Vladimir Lenin had described as "betraying socialism". Stalin had two main options open to him: he could oppose Lenin and challenge him for the leadership of the party, or he could change his mind about supporting the Provisional Government and remain loyal to Lenin.
After ten days of silence, Stalin made his move. In Pravda he wrote an article dismissing the idea of working with the Provisional Government. He condemned Alexander Kerensky and Victor Chernov as counter-revolutionaries, and urged the peasants to form committees to prepare to takeover the land for themselves.
Robert V. Daniels, the author of Red October: The Bolshevik Revolution of 1917 (1967) has argued that Lenin now set about changing the minds of the Bolsheviks. "He was distinctly a father-figure: at forty-eight, he was ten years or more the senior of the other Bolshevik leaders. And he had a few key helpers - Zinoviev, Alexandra Kollontai, Stalin (who was quick to sense the new direction of power in the party), and, most effective of all, Yakov Sverdlov."
Some Bolsheviks such as Lev Kamenev continued to oppose the April Theses. However, Lenin answered his opponents in many articles, pamphlets and speeches and he gradually won over the vast majority of the party.