Although there are exceptional cases such as Germany's, where large enough companies must assign a percentage of the BoD positions

Codetermination/worker representation is a thing in some countries, but with the exception of Germany, it's not half of the BoD.

I'd probably put Sanders left of plenty of European social-democratic parties

I'm sure there are members of social democratic politicians who are as left wing or even more left wing than Bernie. I think if he was European, he would be in the left wing of a social democratic party. But what many people don't seem to want to realize is that we aren't living in the 70s anymore.. Europe might have some remains of social democratic elements left, but barely..

And it certainly isn't "standard governmental procedure". And I do wish Bernies policies were the norm in Europe, but they simply aren't..