a command economy must necessarily prohibit. In order to design production, a command economy must tell people what to do, when to do it, and cannot stand dissent of any kind - because the State manages production. — karl stone
The USSR was a command economy sometimes described as "state capitalism". What the hell does that mean, you ask?
In state capitalism there is one corporation: the state. The state corporation runs industry, commerce, politics, religion, whatever there is to run. That is not "socialism" or "communism" as Marx defined it. It's just a totalitarian society. Marx described a system where all the institutions of capitalism (including the state) were replaced by a bottom-up system of social management.
The American socialist Daniel DeLeon felt that in democratic countries violent revolution was unnecessary and counterproductive, Rather, use the machinery of democracy (unionized work force, the ballot, political organization, education, etc.) to prepare the citizens to assume political and economic control of society.
Marx expected the bourgeoisie (the owning class) to inadvertently prepare the working class to take over the management and operation of production. How would this happen? By workers doing more and more skilled management type work. Employees perform most of the work involved in both managing and running British companies. Per Marx.
Of course, the owners don't expect the employees to take the company away from them. (That happens when the socialists are in power; the ownership of industries, capital property (like office buildings, warehouses, etc.) and so on are transferred to the employees of the companies. The primary task of governing a non-capitalist, socialist society is deciding economic matters: what to produce, how much, where to get the raw materials, and so forth, under the guidance of "production for need".
So and and so forth. I don't expect to convince you that this is what should or will happen. Now, the UK is not the US. Our political and class systems and history are quite different. Workers in the US have tended to have harsher experiences than workers in the UK have had, at least under the post-war labor governments. The same goes for much of Europe, which has had a longer history of social welfare programs than the US.
The US has done a much better job than you Brits of camouflaging the fault lines of class differences. Both the UK and the US have a ruling class, and an overlapping very wealthy class. Most American workers have been taught to not see class. That 5% of the population owns more wealth than the rest of the population is unbelievable to many Americans. Credit that to pervasive miseducation. Americans have drunk the kool aid that "Anyone can get rich in America." Your are poor because you just didn't try hard enough. ETC.