Friedrich (Frederick) Engels:

Engels' introduction into socialism:"At the
request of my friend, Paul Lafargue, ...
I arranged three chapters of this book
(Anti-Dühring) as a pamphlet, which he
translated and published in 1880, under
the title: Socialisme utopique et Socialisme scientifique.

Friedrich Engels: Feuerbach--The Roots of Scialist Philosophy.
Karl Marx: Theses on Feuerbach
This work is a testimony with regard to the method employed by Marx and Engels in arriving at their philosophical conclusions...

Jack London: War of the Classes. Revolution. The Shrinkage of the Planet
(Three Political Essays)

Three political essays by Jack London.

"As yet, to the average bourgeois mind, socialism is merely a menace,
vague and formless... It surely is time that the capitalists knew something
about this socialism that they feel menaces them." (Jack London)

James Baldwin:

James Baldwin (1841-1925) was a school
superintendent in Indiana who became a
book editor for Harper and Brothers and
then for the American Book Company.
A prolific author of books for youth.

"Some of these persons were more famous than others,
yet all have left enduring 'footprints on the sands of time'
and their names will not cease to be remembered. In each
of the stories there is a basis of truth and an ethical lesson
which cannot fail to have a wholesome influence..."
(James Baldwin).