Marxism, Imperialism, and Racism
From Historical tidbits:

Is it a misfortune that magnificent California was seized from the lazy Mexicans who did not know what to do with it?
--Karl Marx

In America we have witnessed the conquest of Mexico and have rejoiced at it. It is to the interest of its own development that Mexico will be placed under the tutelage of the United States.
--Friedrich Engels

. . . it is now completely clear to me that he, as is proved by his cranial formation and his hair, descends from the Negroes from Egypt, assuming that his mother or grandmother had not interbred with a nigger. Now this union of Judaism and Germanism with a basic Negro substance must produce a peculiar product. The obtrusiveness of the fellow is also nigger-like.
--Karl Marx, of Ferdinand Lassalle

Being in his quality as a nigger, a degree nearer to the rest of the animal kingdom than the rest of us, he is undoubtedly the most appropriate representative of that district.
--Friedrich Engels, of Paul Lafargue

Click on the link to read about "An Occasional Discourse on the Nigger Question" by Thomas Carlyle and the views of Charles Dickens.

[link via Dappled Things]