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In page Nikolai Bukharin:

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Even more than earlier Moscow show trials, Bukharin's trial horrified many previously sympathetic observers as they watched allegations become more absurd than ever and the purge expand to include almost every living Old Bolshevik leader except Stalin.[citation needed] For some prominent Communists such as Bertram Wolfe, Jay Lovestone, Arthur Koestler, and Heinrich Brandler, the Bukharin trial marked their final break with Communism and even turned the first three into passionate anti-Communists eventually.[2]