Another aspect, the most infamous in fact, was the Nazi hatred of Jews.
The evidence is clear that Muslims by and large hate Jews, yet no one from the Left ever accuses Muslims of Jewophobia when Israel or Jews are murdered or threatened. Yet they happily trot out the silly term "Islamophobia", despite the massing of evidence demonstrating Islamic violence around the world.
If we look at the criticism of Jews, or those who organize trade groups or other embargoes against Israel, it is always Leftists. Few Leftists, including the US President, would even mentioned that Jews were targeted and murdered during the Charlie Hebdo massacre. Jews are far more likely to be attacked, and are being driven out of Europe, but the left remains largely silent, concentrating instead on "Islamophobia". Of course these were also the same people who took the wrong side during the Cold War so they are not the best nor brightest humanity has to offer.
While no one wants to be identified with an historical figure like Adolf Hitler there are many leftists who do share a portion of his emotional antipathy toward Jews. The evidence is there.