The present article takes as the target to investigate the opening of the borders of the USSR to the world with the intention of expanding the Communist ideas, of teaching the positive experience in the way of construction of the socialism, of attracting the support of the foreign trade unions and intellectuals that were sympathizing to the cause of the Soviet Union and the Bolshevik Revolution, and strengthening of its position in the international stand with a purpose to obtain wide support in case of possible imperialist aggression. With the above mentioned intention in 1927 several events were summoned in Moscow: the celebration of Xth anniversary of the Revolution of October and of the Friends of the USSR Congress; both of them were attended by numerous representatives of the Latin American Trade Unions and intellectuals from the Old and New Worlds. Nevertheless, in spite of the big efforts realized in this one ambience, the work might come down to ashes for the genius, sympathies and antipathies of some its organizers (for example, Victorio Codovilla) initiated and demonstrated during the so called “Rafael Greco case”. In any case, it is possible to conclude, that the achievement of the target was successful. After the celebrations in Moscow there began the work of approaching of the relations between the Comintern and the USSR with its coreligionists in the coast of the Pacific Ocean and in Latin America, that was followed by the foundation of the Latin-American Trade Union Confederation. The importance and innovation of the present investigation stands out in that for the first time the authors use the obtained information of the Russian State Archive of the Political and Social History comparing it with the media and bibliography to report on the particulars of the preparation of the trips of the Latin-American delegates to Moscow in 1927.