The first confrontation between the Left Opposition and the triumvirate occurred from October 1923 to January 1924 over industrialization policies. The triumvirate won decisively at the XIII Party Conference in January 1924. Following Lenin's death in January 1924, the confrontation between the Left Opposition and the triumvirate expanded more openly into a dispute over Trotsky's policies, with the triumvirate accusing Trotsky's policies of being "anti-
Leninist". At the
XIIIth Communist Party Congress in May 1924, the triumvirate's position was further strengthened at the Left Opposition's expense. Another confrontation took place from October to December 1924, during the so-called "Literary Discussion" and criticism of Trotsky's
permanent revolution policy as Stalin proposed
socialism in one country. This resulted in the removal of Trotsky from his ministerial post on 6 January 1925, although Stalin opposed Zinoviev's demand that Trotsky be expelled from the Party. , the de facto Left Opposition leader, pictured in the 1930s With Trotsky largely marginalized, Zinoviev and Kamenev had a falling out with Stalin at the XIVth Communist Party Conference in April 1925 over Stalin's October 1924 proposal of
socialism in one country, which Zinoviev and Kamenev now openly opposed. By this time, the Right Opposition leader, Bukharin, had elaborated on Stalin's socialism in one country policy, giving it a theoretical justification. This solidified the Right Opposition as Stalin's main allies, as the triumvirate of Stalin-Zinoviev-Kamenev from recent years broke up. Soon after the April 1925 Conference, Zinoviev and Kamenev formed the
New Opposition, but they were defeated by Stalin, who was again supported by Bukharin and Rykov, at the
XIVth Party Congress in December 1925. Soon after their defeat at the Congress, Zinoviev and Kamenev joined forces with Trotsky's Left Opposition in early 1926, in what became known as the
United Opposition. From July to October 1926, the United Opposition lost out to Stalin, and its leaders were expelled from the ruling Politburo. In October 1927, soon after
catastrophic events regarding the
Northern Expedition, which confirmed the United Opposition's critical analysis of the
Chinese Communist Party's
support for the nationalist
Kuomintang, the last United Opposition members were expelled from the Communist Party Central Committee; and in November 1927, Trotsky and Zinoviev were expelled from the Communist Party itself, after holding a street demonstration on the tenth anniversary of the October Revolution. In December 1927, the
XVth Party Congress declared Left Opposition and Trotskyist views to be incompatible with Communist Party membership and expelled all leading Left Opposition supporters from the Party. After their expulsion by the XVth Congress, Zinoviev, Kamenev, and their supporters immediately surrendered to Stalin, "admitted their mistakes" and were readmitted to the Communist Party in 1928, although they never regained their former influence and eventually perished in the
Great Purge. Trotsky and his supporters, on the other hand, refused to capitulate to Stalin and were exiled to remote areas of the Soviet Union in early 1928. Trotsky was eventually expelled from the country in February 1929, sent into exile in Turkey. Trotsky's supporters remained in exile, but their resolve began to waver in 1929 as Stalin turned against Bukharin and Rykov and adopted the policy of
collectivization, which appeared to be close to the policies that the Left Opposition had advocated earlier. The Left Opposition attempted to field opposition candidates against the official Communist Party candidates in the
1929 elections, but to no avail. Most (but not all) prominent Left Opposition members recanted between 1929 and 1934, but they nearly all perished during the Great Purge of the mid-late 1930s along with the Oppositionists who remained unrepentant. Some of its members, while claiming to have given up on their old views, participated in the underground opposition in the USSR. They, like
I. N. Smirnov, even maintained contact with Trotsky and his son
Sedov. During this period, the Trotskyists formed an
opposition bloc with several other groups, for example the members of the former
Right Opposition. Historian
Pierre Broué stated that the opposition groups were dissolved in early 1933, when many of its members were arrested. However, some documents found in 2018 showed that the Underground Left Opposition stayed active even in prison; in fact, the prisons became their centers of activity. In the meantime, Trotsky founded the
International Left Opposition in 1930. It was meant to be an opposition group within the Comintern, but members of the Comintern were immediately expelled as soon as they joined (or were suspected of joining) the ILO. The ILO therefore concluded that opposing
Stalinism from within the Communist organizations controlled by Stalin's supporters had become impossible, so new organizations had to be formed. In 1933, the ILO was renamed the International Communist League (ICL), which formed the basis of the
Fourth International, founded in Paris in 1938. Several members of the Left Opposition also engaged in literary-intellectual activities following their forced exile from Moscow during the
interwar period. Radek wrote a biographical account of
Lenin, Rakovsky produced a work on the left-wing socialist
Saint-Simon, Preobrazhensky completed books on the
Soviet economy and the economy of
medieval Europe, Smilga chronicled the Bukharian school of thought, and Dingelstedt produced essays on the social structure of
India. ==Historical evaluation==