“Social democracy is objectively the moderate wing of fascism”
“Concerning the International Situation,” Works, Vol. 6, January-November, 1924, pp. 293-314.
Stalin's speeches, writings and authorised interviews
Context: Social democracy is objectively the moderate wing of fascism.... These organisations (ie Fascism and social democracy) are not antipodes, they are twins.
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Joseph Stalin 95
General secretary of the Communist Party of the Soviet Union 1879–1953Related quotes

“Fascism... was the socialism of ‘proletarian nations.”
Source: The Faces of Janus: Marxism and Fascism in the Twentieth Century, (2000), p. 135

As quoted in “Coughlin, Lemke, and the Union Party,” Dale Kramer, Minneapolis, Farmers Book Store, 1936. Also in “What’s Behind the Christian Front?” Norman Thomas, New York, Workers Defense League, 1939, p. 15 http://www.ajcarchives.org/AJC_DATA/Files/THR-CF6.PDF

Wilhelm Liebknecht, On The Political Position of Social-Democracy https://www.marxists.org/archive/liebknecht-w/1889/political-position.htm (1869 & 1889)

“The forces of moderation and democracy must, and will, prevail against extremism and dictatorship.”
"Journeying to democracy" in The Boston Globe (18 October 2007) http://www.boston.com/bostonglobe/editorial_opinion/oped/articles/2007/10/18/journeying_to_democracy/
Context: I fully understand the men behind Al Qaeda. They have tried to assassinate me twice before. The Pakistan Peoples Party and I represent everything they fear the most — moderation, democracy, equality for women, information, and technology. We represent the future of a modern Pakistan, a future that has no place in it for ignorance, intolerance, and terrorism.
The forces of moderation and democracy must, and will, prevail against extremism and dictatorship. I will not be intimidated. I will step out on the tarmac in Karachi not to complete a journey, but to begin one. Despite threats of death, I will not acquiesce to tyranny, but rather lead the fight against it.

“Bolshevism and Fascism were heresies of socialism.”
Source: Russia Under The Bolshevik Regime (1994), p. 253

So total is the Left's cultural ascendancy that no one likes to mention the socialist roots of fascism (February 16, 2013), The Telegraph
2010s

Source: The Faces of Janus: Marxism and Fascism in the Twentieth Century, (2000), p. 6

Source: Russia Under The Bolshevik Regime (1994), p. 253