In “April 1913 Trotsky wrote a letter to Nikolai Chkheidze, Chairman of the Duma Menshevik fraction, in which he said:
“And what a senseless obsession is the wretched squabbling systematically provoked by the master squabbler, Lenin . . , that professional exploiter of the backwardness of the Russian, working class movement. . . The whole edifice of Leninism at the present time is built up on lies and falsifications and bears within it the poisoned seed of its own disintegration”.
(L. Trotsky: Letter to Nikolai Chkheidze, April 1913, cited in: N.Popov,:, “Outline History of the Communist Party of the Soviet Union”; Volume 1; London; n.d.; p. 289).
Sixteen years later Trotsky did not challenge the authenticity of the letter:
“My letter to Chkheidze against Lenin was published during this period (i.e., l924- Ed.). This episode, dating back to April 1913, grew out of the fact that the ‘official Bolshevik newspaper then published in St. Petersburg had appropriated the title of my Viennese publication, ‘The Pravda — a Labour Paper’. This led to one of those sharp conflicts so frequent in the lives of the foreign exiles. In a letter written to Chkheidze, I gave vent to my indignation at the Bolshevik centre and at Lenin. Two or three weeks later, I would undoubtedly have subjected my letter to a strict censor’s revision; a year or two later still, it would have seemed a curiosity in my own eyes. But that letter was to have a peculiar destiny. It was intercepted on its way by the Police Department. It rested in the police archives until the October revolution, when it went to the Institute of History of the Communist Party”.
(L. Trotsky: “My Life”; New York; 1970: p. 5l4-5)
NOTE: Complete transcript of the Letter (1913) can be found in “Revolutionary Democracy” Journal, Vol.XX, No.1 (April, 2014)