As for one-party rule, it was questioned neither by the Left Opposition nor by the Right [wing of the Communist party]. All were prisoners of their o… - Leszek Kołakowski

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As for one-party rule, it was questioned neither by the Left Opposition nor by the Right [wing of the Communist party]. All were prisoners of their own doctrine and their own past: all had worked with a will to create the apparatus of violence that crushed them. Bukharin’s hopeless attempt to form a league with Kamenev was no more than a pitiful epilogue to his career. In November 1929 the deviationists performed a public act of penance, but even this did not save them. Stalin’s victory was complete; the collapse of the Bukharinite opposition meant the triumph of autocracy in the party and in the country. In December 1929 Stalin’s fiftieth birthday was celebrated as a major historical event, and from this point we may date the “cult of personality”. Trotsky’s prophecy of 1903 had come true: party rule had become Central Committee rule, and this in turn had becorne the personal tyranny of a dictator. (pp. 42-3)