The question of whether or not Stalinism was a logical continuation of Leninism is a difficult one. Stalinism did take significantly more drastic measures than Leninism did. There were differences in policy. But in spite of these, Stalinism still found its basis in Leninism. Even Trotsky, a friend of Lenin and a staunch opponent of Stalin, grudgingly admits that "Stalinism did issue from Bolshevism" (Trotsky). Stalin's policy of socialism in one country, his use of terror to eliminate opposition, and his suppression of democracy and the soviets were all characteristics of Lenin well before they were characteristic of Stalin. Although some of Stalin's policies were different from those of Lenin, what difference Stalinism did show from Leninism were either policies which Lenin had called for but never put into action, or logical continuations of Lenin's original principles, but modified to suit the demands of the time.
One of Stalin's main focuses was on the concept of "socialism in one country" - that is, the focus on the betterment exclusively of his own country rather than on the international communist revolution. "Socialism in one country" began with Lenin. In 1918 Lenin signed the Treaty of Brest-Livtosk, which pulled Russia out of WW1 and surrendered much of the Ukraine to Austria-Hungarian forces ("How Lenin Led to Stalin"). At this time, there was a revolutionary movement in the Ukraine composed of peasants and workers known as the Makhnovist movement. This group needed only the support of Lenin and Russia to launch their own socialist revolution. However, they were not given this support ("How Lenin Led to Stalin"). Clearly, Lenin's focus was on the well being of Russia rather than the International Communist Movement. He was focused on Socialism in One Country. Stalin would later echo Lenin's actions, compromising his political ideals for the sake of peace, when Stalin signed a non-aggression pact with Adolf Hitler on August 23, 1939.
In addition to a focus on socialism only within his own country, Stalin also focused on a concentration of governmental control of industry and agriculture. This policy, originated by Lenin under the moniker of state capitalism, was a clearly established goal of Leninism well before Stalin implemented it. Lenin said that "Socialism is nothing but state capitalist monopoly made to benefit the whole people" ("How Lenin Led to Stalin"). It is clear that his idea of socialism was one of governmental economic control. Moreover, Lenin fully intended for this plan to be implemented. He said that "If we introduced state capitalism in approximately 6 months' time we would achieve a great success" ("How Lenin Led to Stalin").
As the government gained more and more control over the economy, Lenin felt it necessary to defend his actions. He published an article in April of 1918 in which he stated that "Unquestioning submission to a single will is absolutely necessary for the...