Much attention has Been Paid to Lenin's attack on Stalin in the last months of 1922 and early 1923, and rightly so, for this episode was critical in the career of Stalin, and, possibly, in the history of Russia. To a major extent the non-Bolshevik observer was until 1956 dependent on the testimony of Leon Trotsky for knowledge of this hidden struggle. This was only a limited disadvantage, for Trotsky was a first-rate writer, and the documents that he produced have proven reliable without exception. But Trotsky did not have in his possession a number of important documents pertaining to the affair, nor did he, and other scholars, exhaust the resources of his archives in this connection.