The country has undergone a profound social upheaval, the greatest the proletariat has ever known.

Technological discoveries are the spermatozoa of social change.

One of the surest signs of the estimated changes in the consciousness of the American proletariat is to be found in the character of the demands now being put forward by the leadership.

The international proletariat first appeared on the scene in the early Thirties of the nineteenth century, and its first great action was the French Revolution of 1848.

Not in vain does it [the proletariat] go through the stern but steeling school of labour. It is not a question of what this or that proletarian, or even the whole proletariat, at the moment regards as its aim. It is a question of what the proletariat is, and what, in accordance with this being, it will historically be compelled to do.

The most striking development of the great depression of 1929 is a profound skepticism of the future of contemporary society among large sections of the American people.