Those things are much more radical than anything you see in Europe, he isn't left-liberal, he is about as far left you can go without being outright communist. Note that I myself support left-wing liberalism very much, I want public healthcare, strong separation between religion and state, free speech etc, that isn't what makes Sanders far left, it is all the other things he also wants to do.
Everything I mentioned here is all on his homepage: https://berniesanders.com/issues/corporate-accountability-an...