The period of 1933-1938 offers a wealth of information on how dictatorships are set up, how a war economy is financed (quantitative easing), the march through the institutions, censorship etc.
The other obvious parallel, Stalin, is more messy because a revolution started it all. Germany went from fragile democracy to full dictatorship overnight with the enabling laws (after the Nazis had marched through the institutions for about a decade).
It is a perfect analogy and does not mean that all of the "progressive" left are Nazis (though some of them would have participated in the Nazi movement, too, because they are just power hungry and don't care about the specifics of the cause).
The other obvious parallel, Stalin, is more messy because a revolution started it all. Germany went from fragile democracy to full dictatorship overnight with the enabling laws (after the Nazis had marched through the institutions for about a decade).
It is a perfect analogy and does not mean that all of the "progressive" left are Nazis (though some of them would have participated in the Nazi movement, too, because they are just power hungry and don't care about the specifics of the cause).