There is an upside to socialism. The concentration camps that come with all socialist regimes are not bugs. They are features.
There is a big difference between the Marxist/Leninist Socialism of Russia, and the Democratic Socialism of Denmark, Norway and Sweden. So far as I know the three Scandinavian countries are not known for having concentration camps. Below is a lot of information.
https://en.wikipedia.org/wiki/Socialism This is a detailed description of the history of Socialist related movements.
https://en.wikipedia.org/wiki/Types_of_socialism This is a more defined listing of the many types of Socialist named (at least 10) or socialist related kinds of social/economic organization.