It's true that aside from personal projects, Soviet artists had to produce paintings that followed the Party line, emphasizing the benefits and glories of the Motherland under scientific socialism. I've long contended that political art is almost always inferior art, especially to the extent that the political point being made dominates the work.
As for style, the Establishment view is simply an aspect of the now-aging assertion that, aside from Renaissance-era and 17th century Dutch painting (think Rembrandt and Vermeer), pre-modernist Western painting is largely worthy of contempt, and Modernism is the destiny of artistic evolution.
I've been disagreeing with that concept on the Internet for the last 14 years, preferring paintings that are interestingly and technically well done while for the most part depicting reality with reasonable fidelity given the artist's intent and capability.
So in this and related posts I examine some Socialist Realist paintings in terms other than political messaging.
I can do this because when I was in Málaga, Spain in November I visited a branch of Saint Petersburg's excellent Russian Museum. It was holding a year-long (ending February 2019) exhibit titled "The Radiant Future: Socialist Realism in Art." A fine exhibit. Plenty of examples, some of which I knew about before I visited. Of course I took lots of snapshots.
The painter featured in the present post is Vasily Prokofievich Yefanov (1900-1978), also spelled Vasili Efanov. His Wikipedia entry in English and Russian is minimal, so link here for information regarding him. It mentions that he "was a master of the ceremonial portrait, communist (since 1954), and five-time winner of the Stalin Prize (1941, 1946, 1948, 1950, 1952). Besides, a full member of the Academy of Arts of the USSR (1947) and People’s Artist of the USSR (1965)."
I deal with one of his large works below. Click on images to enlarge.
The entire painting. You can gauge its size by reference to the plaque at the right and the museum floor: nearest subjects are depicted a little less than life-size.