During the spring of 1933, Stalin's police rounded up nearly one hundred thousand people as part of the Soviet regime's "cleansing" of Moscow and Leningrad and deported them to Siberia. Many of the victims were sent to labor camps, but ten thousand of them were dumped in a remote wasteland and left to fend for themselves. Cannibal Island reveals the shocking, grisly truth about their fate.

These people were abandoned on the island of Nazino without food or shelter. Left there to starve and to die, they eventually began to eat each other. Nicolas Werth, a French historian of...