The collapse of the Soviet Union spawned an entire genre of literature: the Gulag memoir, produced by victims of the USSR’s concentration camps. A few masterpieces were published in the West, or in samizdat, before the 1980s, for example Evgenia Ginzburg’s renowned Into the Whirlwind and the works of Alexander Solzhenitsyn.But as Soviet-style communism fell apart, the long-suffering voices were allowed to speak, and in Russia an enormous number of first-person books and articles began appearing.In her brilliant 2004 Gulag, Anne Applebaum wrote the best history of the Soviet camps to appear outside of what was once referred to as the Eastern bloc. That was a monumental achievement. But it may be the last such work, since in the present age of forgetting, inspired by Vladimir Putin’s neo-nationalism, Russian archives have become extremely difficult to enter, and a vast store of material about crimes of the Soviet era may be lost forever.