In the Soviet era, and particularly during dictator Josef Stalin’s purges, one of the many fears was of a knock on the door when no guests were expected. Night or day, it could mean that agents of the state had come for you — and that you could be arrested, condemned in a cursory trial,
MoreKremlin critic Aleksei Navalny says he duped a Russian agent into revealing how the country's Federal Security Service (FSB) poisoned him with Novichok.
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