The episodes are not yet a mass phenomenon, but they illustrate the building paranoia and polarization in Russian society. Citizens are denouncing one another in an eerie echo of Stalin’s terror, spurred on by vicious official rhetoric from the state and enabled by far-reaching new laws that criminalize dissent.

There are reports of students turning in teachers and people telling on their neighbors and even the diners at the next table. In a mall in western Moscow, it was the “no to war” text displayed in a computer repair store and reported by a passer-by that got the store’s owner, Marat Grachev, detained by the police. In St. Petersburg, a local news outlet documented the furor over suspected pro-Western sympathies at the public library; it erupted after a library official mistook the image of a Soviet scholar on a poster for that of Mark Twain.

In the western region of Kaliningrad, the authorities sent residents text messages urging them to provide phone numbers and email addresses of “provocateurs” in connection with the “special operation” in Ukraine, Russian newspapers reported; they can do so conveniently through a specialized account in the Telegram messaging app. A nationalist political party launched a website urging Russians to report “pests” in the elite.