Well yes, the USSR was no doubt an authoritarian regime, however it often did function fairly well as an economic system, at least in terms of serving people’s needs. AS I have cited before, a study has demonstrated that socialist systems with a command economy do tend to meet the needs of the people better (there are more public health services, more education services, and generally socialist countries have a higher caloric intake in relation to caloric need than capitalist countries of comparable economic development) but as you said, it does tend towards oppressive hierarchy, which is really the antithesis of socialism. Stalin chose to pursue industrialization at the cost of exporting crucial grain, which was a large factor of the Holodomor. Ultimately, it was not state socialism, but devolution into state capitalism that caused stagnation and deterioration of public services. This is why I ultimately reject authoritarian socialism, but recognize that the state does have a place in instituting beneficial public services to the public, however, to preserve liberty, I believe it is ultimately incumbent on the workers to directly control the means of production.