Russia is not a favorable topic recently due to the war with Ukraine, but this series is worth watching even now.
Provincial Kazan, late 80s. The Soviet Union mindset and style of living are falling apart (arguably, it only ever existed on Soviet TV). The grip of the Communist Party is already loose. There is nothing substantial inside, only rituals.
The protagonist gets robbed and beaten on his school commute by a local youth gang member. Adults have nothing to offer him besides an extra dose of propaganda. It's not something that the party really cares about. Some down-to-earth militia officers see the problem but can do nothing. According to Soviet laws of that time, young gang members are free to go until they kill someone. That's what adult criminals quickly start to abuse. They organize hierarchical gangs of teenagers, offering them protection and some sort of moral codex. But the codex isn't set on paper, and thugs can interpret it however they like. What comes next is the classical story of any gang film in the world. The spiral of violence is starting to spin.
The series tries to portray the epoch surgically. The scenarist did a terrific job. Slang, music, costumes, actors' play - everything is perfect. Unfortunately, the series is rooted too deep in history, and to fully enjoy it, you should be aware of the late Soviet Union. But anyway, highly recommended.