The son of a Siberian peasant, MIKHAIL KORIAKOV won his spurs as a Soviet journalist and literary critic while still in his thirties. But because of barbed-wire political entanglements which sometimes impede a writer in the Soviet Union, in 1939 he sought to bury himself as a ' “brain worker“ on the Tolstoy Estate at Yasnaya Polyana. During the war Mr. Koriakov took part in the defense of Moscow, and later was made military correspondent to the General Staff, an assignment which took him to every sector of the 2000-mile Russian front. After the war he escaped from the Soviet Embassy in Paris and came to Brazil, where he wrote I’ll Never Go Back.