 Afterwards, he worked for the Comintern at the International Leninists School, as a journalist.Kramarov was strongly involved in the promotion of rocketry and space travel in the Soviet Union, and was a founder and the chairman of the Society for Studies of Interplanetary Travel in 1924.In later years, he wrote two books on the early history of space exploration in Russia, "The World's First Society of Interplanetary Flight" and "The Dawn of Cosmonautics" (1965).