SHORT STORIES (W THE LONG DEATH, by Yechezkel Pulerevitch. 293 pp (published in Israel by former Prisoners of Zion from the USSR). AN AMERICAN IN THE GULAG, by Alexander Dolgun. 370 pages (Collins/Harvill) 370pp £4.50. Yechezkel Pulerevitch was a member of Betar, the youth group of Herut, when the Red Army invaded Lithuania in 1940….