Analysis of information sources in references of the Wikipedia article "Leon Trotsky" in English language version.
The authenticity of this letter, which has been in doubt for twenty years, was personally confirmed to the writer by Leon Trotsky in conversation in Mexico City, in September 1937; the letter was auctioned in 1990. Pyle, Richard (23 March 1990). "Revolutionary's Letter to Lenin Auctioned". Associated Press. Retrieved 10 April 2023.
Trotsky was a leader of a small group, the Mezhraionts, consisting of almost four thousand members.
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