Untermann professed an adherence to the thinking of Karl Kautsky and Joseph Dietzgen.
Ideology and Superstructure also offered a critique of competing interpretations of Marxian thought, particularly that associated with Karl Kautsky and that with Max Adler.
Being a skilled organizer and publicist, Mendelson personally befriended many foremost European socialists - Friedrich Engels, Karl Liebknecht, Eduard Bernstein, Karl Kautsky, Paul Lafargue, Georgi Plekhanov and others.
Karl Marx | Karl Pilkington | Karl Lagerfeld | Karl G. Heider | Karl Rove | Karl Pearson | Karl May | Karl Liebknecht | Karl Friedrich Schinkel | Karl Dönitz | Karl Jenkins | Karl Stefanovic | Karl Bodmer | Karl Wilhelm Friedrich Schlegel | Karl Malone | Karl Wolf | Karl Valentin | Karl Popper | Karl Malden | Karl Kesel | Karl Barth | Karl Richard Lepsius | Karl Philipp von Wrede | Karl Kautsky | Karl Johans gate | Karl-Heinz Kämmerling | Karl | Karl Weierstrass | Karl Story | Karl Scheel |
Theodor Liebknecht, brother of the assassinated German Spartacist leader Karl, acted as a lawyer for the defense; the venerable anarchist P.A. Kropotkin appealed personally to Vladimir Lenin to spare the lives of the defendants, Karl Kautsky wrote impassioned pamphlets about the trial and American trade unionists demonstrated for the release of the SRs.
In these late years, Lafargue had already distanced himself from any form of political activity, living on the outskirts of Paris in the village of Draveil, limiting his contributions to a number of articles and essays, as well as occasional contacts with some of the most outstanding socialist activists of the time, such as Karl Kautsky and Hjalmar Branting of the older generation, and Karl Liebknecht or Vladimir Lenin of the younger generation.
The previous year he and Professor Walther Schucking had edited The Outbreak of the World War - German Documents collected by Karl Kautsky (commonly known as the Kautsky Documents) which were published by the Oxford University Press.
The suggestion of a possible "Ultraimperialismus" is normally attributed to Karl Kautsky, the leading theoretician of the Social Democratic Party of Germany (SPD) in the era of the Kaiserreich.