discontent with Russia's involvement in the war, and many were calling for an end to it. There were great shortages of food and supplies, which was difficult to remedy because of the wartime economic conditions. The political group that proved most troublesome for Kerensky, and would eventually overthrow him, was the Bolshevik Party, led by Vladimir Lenin. Lenin had been living in exile in neutral Switzerland and, due to democratization of politics after the February Revolution, which legalized formerly banned political parties, he perceived the opportunity for his Marxist revolution. Although return to Russia had become a possibility, the war made it logistically difficult. Eventually, German officials arranged for Lenin to pass through their territory, hoping that his activities would weaken Russia or even – if the Bolsheviks came to power – lead to Russia's withdrawal from the war. Lenin and his associates, however, had to agree to travel to Russia in a sealed train: Germany would not take the chance that he would foment revolution in Germany. After passing through the front, he arrived in Petrograd in April 1917. On the way to Russia, Lenin prepared the April Theses, which outlined central Bolshevik policies. These included that the Soviets take power (as seen in the slogan "all power to the Soviets") and denouncing the liberals and social revolutionaries in the Provisional Government, forbidding co-operation with it. Many Bolsheviks, however, had supported the Provisional Government, including Lev Kamenev. With Lenin's arrival, the popularity of the Bolsheviks increased steadily. Over the course of the spring, public dissatisfaction with the Provisional Government and the war, in particular among workers, soldiers and peasants, pushed these groups to radical parties. Despite growing support for the Bolsheviks, buoyed by maxims that called most famously for "all power to the Soviets", the party held very little real power in the moderate-dominated Petrograd Soviet. In fact, historians such as Sheila Fitzpatrick have asserted that Lenin's exhortations for the Soviet Council to take power were intended to arouse indignation both with the Provisional Government, whose policies were viewed as conservative, and the Soviets themselves, which were viewed as subservients to the conservative government. By some other historians' accounts, Lenin and his followers were unprepared for how their groundswell of support, especially among influential worker and soldier groups, would translate into real power in the summer of 1917. On 18 June, the Provisional Government launched an attack against Germany