Extreme socialism is when the government seizes the means of production and runs it under central planning. Owners of corporations are SOL, and either dead or living in exile.
Fascism is when government coopts all the corporate owners to work together with government, so government and corporations are in cahoots to the detriment of the workers. Cooperative owners are still owners and usually get very rich from the deal.
Very easy to tell the difference. Nazis were socialists like the Democratic People's Republic of Korea is Democratic, of the people, or a Republic.
