Unwritten rules of hooligans of Soviet time (70s - 80s):
It's always one to alone.
The beating of the group was allowed only in exceptional situations. If the guy went with a girl, it could not be touched. It was considered a humiliation of a guy and an insult to the girl.
The name of the elders to solve problems was considered cowardice. If friends have a problem, you must help. Otherwise it is a betrayal. For the fight there was always the reason, no one loved the scumbags and no one came up for them.
Younger and girls could not be offended. For this, they were punished.
If you find yourself in a new company and brag, but you can not confirm your words. It was punished.
He began to meet with a girl from the other courtyard / district / street, be ready to prove that you are a real man. Friends were right for you to enroll.
Senior always in authority and always listened to them. They always joined the younger.
If the girl started smoking or drinking, respect for it was lost. Meet the fallen girl meant to lose face among friends.
If the guy called the girl shl ... ... oh and it was not so, for it he was strongly punished.
Nobody loved commercials. Friends did not pass under any circumstances.
A source