How do these people relate to Democratic Socialists in the United States of America in the twenty-first century, since that's the political affiliation of the person we're actually talking about?

Taken to its extreme, any system of government is bad. The people you list there have one thing in common and it's not socialism: they were all malignant narcissists. A malignant narcissist in charge of any government -- left or right wing, communist or capitalist -- will create chaos, death, and destruction. Witness now, the American government falling into fascism under the leadership of yet another malignant narcissist. If things keep going this way, the US will suffer the same fate as the USSR. Not because the US fell to socialism, but because it fell to narcissistic authoritarianism.

Mamandi, for his part, is not a malignant narcissist, so New York should probably not turn out like Soviet Russia. The US as a whole on the other hand may not be so lucky.