Unwilling to resort to Stalin's mass purges and executions, Soviet officials have dismissed dissenters from their jobs, sent them to forced-labor camps, and confined them to prison mental institutions. Their most recent method appears to be a kind of involuntary exile: they allow a dissenter to travel abroad and then snatch away his passport. Last week, after eight months of research in Britain, Zhores Medvedev, a geneticist and gerontologist of international reputation, was called to the Soviet embassy in London where his passport was revoked and he was told that he was no longer a Soviet citizen.
Medvedev had long...