you mentioned a person whom stalin had succeeded; who was he?
He was a Russian revolutionary, politician, and political theorist.
Vladimir Lenin
Vladimir Ilyich Ulyanov (22 April 187021 January 1924), better known by his alias Lenin, was a Russian revolutionary, politician, and political theorist. 
who was the ruthless dictator who was intent on spreading communism in the soviet union and abroad Joseph Vissarionovich Stalin whom did he succeed? Vladimir Lenin was the former person the editor of any magazine or something like that? Yes, he was an editor for a daily newspaper "Pravda" ("Truth") did he sign any pact with germany? Yes, They signed the Molotov-Ribbentrop pact with Germany and what was that about? It was a non-aggression pact between Nazi Germany and the Soviet Union that enabled those two powers to partition Poland between them. was there any allegations against him? In 2006, the Ukrainian Parliament declared it to be such, and in 2010 a Ukrainian court posthumously convicted Stalin, Lazar Kaganovich, Stanislav Kosior, and other Soviet leaders of genocide.
wiki:9130608
Vladimir Lenin [SEP] Introduction
Vladimir Ilyich Ulyanov (22 April 187021 January 1924), better known by his alias Lenin, was a Russian revolutionary, politician, and political theorist. He served as head of government of Soviet Russia from 1917 to 1924 and of the Soviet Union from 1922 to 1924. Under his administration, Russia, and later the wider Soviet Union, became a one-party Marxist–Leninist state governed by the Communist Party of the Soviet Union. Ideologically a communist, he developed a variant of Marxism known as Leninism. Born to a moderately prosperous middle-class family in Simbirsk (now Ulyanovsk), Lenin embraced revolutionary socialist politics following his brother's 1887 execution.