Che Guevara
In Guevara's private writings from this time (since released), he displays his growing criticism of the Soviet political economy, believing that the Soviets had "forgotten Marx". This led Guevara to denounce a range of Soviet practices including what he saw as their attempt to "air-brush the inherent violence of class struggle integral to the transition from capitalism to socialism", their "dangerous" policy of peaceful co-existence with the United States, their failure to push for a "change in consciousness" towards the idea of work, and their attempt to "liberalize" the socialist economy. Guevara wanted the complete elimination of money, interest, commodity production, the market economy, and "mercantile relationships": all conditions that the Soviets argued would only disappear when world communism was achieved. Disagreeing with this incrementalist approach, Guevara criticized the "Soviet Manual of Political Economy", correctly predicting that if USSR did not abolish the law of value (as Guevara desired), it would eventually return to capitalism.
Che (2008 film)
Soderbergh wanted to incorporate Guevara's experiences in Cuba and at the United Nations in 1964. Buchman helped with the script's structure, which he gave three storylines: Guevara's life and the Cuban Revolution; his demise in Bolivia; and his trip to New York to speak at the U.N. Buchman found that the problem with containing all of these stories in one film was that he had to condense time and this distorted history. Soderbergh found the draft Buchman submitted to him "unreadable" and after two weeks decided to split the script into two separate films. Buchman went back and with Del Toro expanded the Cuban story for "The Argentine". Additional research included reading Guevara's diaries and declassified documents from the U.S. State Department about his trip to New York and memos from his time in Bolivia.