A man who has read Wallace and Darwin is ready to read Marx and engels.
"Socialism: Positive and Negative"
Robert Rives La Monte
In the beginning of the revolutionary movement Communism denoted what we now call Socialism; for example, the Communist Manifesto of Marx and engels became the platform of the Social-democratic parties.
"The Book of Life: Vol. I Mind and Body; Vol. II Love and Society"
Upton Sinclair
And Karl Marx and Friedrich engels, in 1848, summoned the proletariat of the whole world to make it the aim and instrument of a universal revolution.
"Contemporary Socialism"
John Rae