Аннотация:Lysenkovsky censorship of books on genetics and the evolutionary theory had the background connected with transition from the allied relations of the USA and Great Britain with the USSR during World War II by the beginning of Cold War. The Soviet geneticists have used these allied relations, having published in the prestigious American magazine "Sayens" two articles in 1945 and 1947 of A.R. Zhebrak and N.P. Duninin with criticism of T.D. Lysenko. In archives there are no Dubinin’s letters to the American colleagues, and, most likely, he didn’t write them at this time. But there are several letters of Zhebrak to I. M. Lerner, and Lerner’s correspondence with American geneticists and with the “Science” editorial office in connection with Zhebrak’s visit to the US in 1945. This correspondence is undoubtedly a unique source for several interesting and important questions. Four Zhebrak’s letters among a set of other letters in Lerner’s archive, including letters of many other Soviet geneticists, are sufficient and strong reason for two statements. Unfortunately, after all many documents already can not be found at all: they either have been lost, or destroyed for different physical causes, or eliminated by their owners. But nevertheless in archives of the US and Russia there are enough documents which can be basis for new studies and new serious views on the past.