Professor Dirac and Soviet physicists

The article recounts Professor Dirac's acquaintance, scientific contacts, and friendship with Soviet physicists. Particular attention is devoted to his relations with Professors P. L. Kapitsa, I. E. Tamm, V. A. Fock, and Ya. I. Frenkel'. A chronicle of Dirac's visits to the Soviet Union before and after the war is presented. The article concludes with the author's brief personal impressions of his meeting with the English scientist.