Also here’s a good article on it: https://www.jacobinmag.com/2017/08/sweden-social-democracy-meidner-plan-capital
EDIT: Sort of related, Norway does have sovereign wealth funds that own large portions of the national economy in a similar way, though it still falls far short of anything resembling full socialism: https://en.m.wikipedia.org/wiki/Government_Pension_Fund_of_Norway
The PRC has a similar fund, which is relatively new: https://en.m.wikipedia.org/wiki/China_Investment_Corporation
Sweden: https://en.m.wikipedia.org/wiki/Rehn–Meidner_model
Also here’s a good article on it: https://www.jacobinmag.com/2017/08/sweden-social-democracy-meidner-plan-capital
EDIT: Sort of related, Norway does have sovereign wealth funds that own large portions of the national economy in a similar way, though it still falls far short of anything resembling full socialism: https://en.m.wikipedia.org/wiki/Government_Pension_Fund_of_Norway
The PRC has a similar fund, which is relatively new: https://en.m.wikipedia.org/wiki/China_Investment_Corporation