1. STALIN

2. On May 25, 1922, Lenin suffered a stroke while recovering from surgery to remove a bullet lodged in his neck since a failed assassination attempt in August Severely debilitated, he went into semi-retirement and moved to his dacha in Gorki. After this, Trotsky and Stalin were concerned about who was going to be the next successor. Trotsky and Lenin had more of a personal relationship and Lenin and Stalin had more of a political relationship. Yet, Stalin visited him often, acting as his intermediary with the outside world.[2] During this time, the two quarrelled over economic policy and how to consolidate the Soviet republics. Lenin and Stalin were agreeing on more political ideas than disagreeing, which was creating a closer relationship. One day, Stalin verbally swore at Lenin's wife for breaching Politburoorders by helping Lenin communicate with Trotsky and others about politics;[2] this greatly offended Lenin. As their relationship deteriorated, Lenin dictated increasingly disparaging notes on Stalin in what would become his testament.

3. Trotsky criticised Stalin's rude manners, excessive power, ambition and politics, and suggested that Stalin should be removed from the position of General Secretary to Lenin. One of Lenin's secretaries showed Stalin the notes, whose contents shocked him.[2] Before Stalin could mend any bridges, Lenin suffered a heart attack on March 10, 1923 which left him completely incapacitated.

4. During Lenin's semi-retirement, Stalin forged an alliance with Lev Kamenev and Grigory Zinoviev against Trotsky. These allies preventedLenin's Testament from being revealed to the Twelfth Party Congress in April 1923.[2] Although they too were disconcerted by Stalin's power and some of his policies, they needed his help in opposing Trotsky's faction and his possible succession to Lenin in a power struggle.

5. Lenin died of a stroke on January 21, 1924
Lenin died of a stroke on January 21, Stalin was given the honour of organising his funeral. Upon Lenin's death, Stalin was officially hailed as his successor as the leader of the ruling Communist Party and of the Soviet Union itself. Against Lenin's wishes, he was given a lavish funeral and his body was embalmed and put on display. Thanks to Kamenev and Zinoviev's influence, the Central Committee decided that Lenin's Testament should not be made public. At the Thirteenth Party Congress in May, it was read out only to the heads of the provincial delegations. Trotsky did not want to appear divisive so soon after Lenin's death and did not seize the opportunity to demand Stalin's removal.[5]