Like with any philosophy there are a range of opinions which can all be grouped under one label.
Bernie is on, to my mind, a bit of an extreme end, but his basic policies are middle mainstream in all of northern Europe, Britain, Canada and most of the OECD though I"m not able to pick and choose others.
Pretty much all of those countries (certainly Canada) are much more successful countries that are much better to live in than the USA. The US is demonstrating it's dysfunction right now. Just compare the way our politicians are co-operating and the resultant much lower infection and death rates here. We are winning you are f***ing up!