Most of the documents date back to the summer of 1940.
The government files containing these letters are kept in the General Archive of the Nation.
Volkov asserts that the mastermind behind the attack was Vicente Lombardo Toledano, secretary general of the Workers’ Confederation of Mexico.
It all ended on August 20, 1940, when Trotsky was assassinated by Ramón Mercader, a Spaniard working for Soviet intelligence services.
The letters contained all kinds of accusations against Trotsky.
Fuente: http://elpais.com/elpais/2016/09/15/inenglish/1473950083_151075.html
