Dictatorship in the Soviet Union meant police breaking down your door and sending you to a prison camp in Siberia for 10 years for rumors that you said something objectionable. Leftism in San Francisco means you get dirty looks if you were a MAGA cap in public and you don't have enough power to get elected officials who agree with you. Not really the same.
I lived in the Soviet Union for almost 35 years since my birth. Who of us knows life there better?)))))
I'm sure you know it very well, and the analogy is still very hard to sustain.