Well yes this is true. As Earl points out and I did earlier, there's a case to made that the extreme left and right share similarities at least in the way they operate.The reality is both your and in @InBenjiWeTrust posts re this topic are accurate at different times during the development and subsequent democratically elected ascent to power of the NAZI party.
And as for murdering minorities, weakening unions and working with private industrialists the same is true for far left regimes.