"Hitler had a red flag. And Stalin had a red flag. Hitler ruled in the name of the workers’ class, his party was called the workers’ party. Stalin also ruled in the name of the workers’ class; his power system officially bore the title of ‘dictatorship of the proletariat.’ Hitler hated democracy and struggled against it. Stalin hated democracy and struggled against it. Hitler was building socialism. And Stalin was building socialism. Under the title of socialism Hitler saw a classless society. And Stalin, under the title of socialism, saw a classless society. In the midst of the classless society built by Hitler, and in that built by Stalin, flourished slavery in the truest sense of the word."
https://en.wikiquote.org/wiki/Fascism's_relationship_with_other_political_and_economic_ideologies