On June 2, 1962, Soviet soldiers fired on a demonstration by workers demanding better living conditions and lower prices. The shooting took place in downtown Novocherkassk, an industrial city near Rostov-on-Don. More than 25 people were killed, and more than 85 people were injured. For decades, the Soviet authorities kept the incident a secret, executing another seven demonstrators and sentencing another 100 participants to 10 years in prison. The truth about the Novocherkassk massacre only started leaking to the media during Perestroika, and a formal investigation didn’t occur until after the collapse of the USSR.

https://meduza.io/en/feature/2017/11/23/the-novocherkassk-massacre