Each man has an equal social right to multiply his power of motion by all the social factors of civilization. Private property in any of these factors is inconsistent with this fundamental right; it must, obviously, prove a source of economic despotism and industrial slavery.

He is regarded as the forefather of the idea of revolutionary industrial unionism and was the leading figure in the Socialist Labor Party of America from 1890 until the time of his death. Daniel DeLeon (December 14 1852 – May 11 1914) was an American socialist newspaper editor politician Marxist theoretician and trade union organizer.