In 1931, an enormous apartment building was completed in Moscow. Challenging the Kremlin for architectural supremacy on the Moskva River, it was the largest residential building in Europe, combining 505 furnished apartments with every modern luxury - a cinema, library, tennis court and shooting range. But the residents of this monstrous tower block were no ordinary Russians. They were the top Communist officials - many of whom were taken from this building and destroyed in Stalin’s purges. Yuri Slezkine, a professor from the University of California, has trawled through the letters, diaries and interviews of these residents. He joins me on the pod to offer a fascinating glimpse into the heart of Soviet terror tactics.