All forms of private business were forbidden in the Soviet Union. Punishment: 5 years of imprisonment and confiscation of property.
Individual state-owned butcheries were managed by regional centers, which belonged to the ministry of meat and dairy industry. They planned how many pigs would be grown, how they would be distributed among butcheries, etc.
Everything was at the mercy of central planning. If they planned for less than the actual demand (a very common occurrence), then there'd be no meat left by the time the last 40-50-60% got to a butchery.
Personal contacts were very valuable. People in the know could tell you in advance when the next shipment of meat would arrive, or even hide it away for you in a backroom.
Over decades, a huge acquaintance-based shadow economy formed. Positions like butchers and store managers became some of the most desirable jobs in the society, since they effectively decided who got to eat meat (in return for similar favors) and who didn't.
Since there were no real elections and no competition, there was no way for an average citizen to express dissatisfaction neither politically nor economically.
And it was like this with pretty much everything. Even toilet paper was something that had to be hoarded, because its supply was unpredictable. Being a woman was especially difficult as central planners assigned very low priority to female hygenic products.
If you complained enough to get noticed, there were psychiatric hospitals waiting for you because one had to be mentally ill to believe in the superiority of free-market capitalism.