“The proletariat stands politically as well as socially in the most abrupt contradiction to the present class state. It must fight it on all fields and upon every question, both of domestic and of foreign policy.”
No Compromise – No Political Trading (1899)
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Wilhelm Liebknecht 53
German socialist politician 1826–1900Related quotes

Collected Works, Vol. 15, pp. 191–201.
Collected Works

1930s, Die verfluchten Hakenkreuzler. Etwas zum Nachdenken (1932)

Writing in the Chartist newspaper (1847), in Marx Engels Collected Works Vol 6, pg 290.

“Those Damn Nazis: Why Are We Socialists?” https://research.calvin.edu/german-propaganda-archive/haken32.htm written by Joseph Goebbels and Mjölnir, Die verfluchten Hakenkreuzler. Etwas zum Nachdenken, Nazi propaganda pamphlet (Munich: Verlag Frz. Eher, 1932)
1930s

Section 1, paragraph 44, lines 1-2.
The Manifesto of the Communist Party (1848)

System of Transcendental Philosophy (1800)

Article in Labour Leader, September 1904.
"Keir Hardie's Speeches and Writings", edited by Emrys Hughes ("Forward" Printing and Publishing Company Ltd, Glasgow, 1928), pp. 118, 120.