The article shows how the fates of Yu. G. Oksman and O. E. Mandelstam intercross, it also dwells on Oksman’s part in preparing the American version of the poet’s collected works. This topic is revealed in the context of the ХХth century history of national culture. Epistolary, memoir and biography sources are used widely. Oksman’s part in the process of reuniting different Russian literature branches is specially highlighted.