Read this and thought it was pretty good and short The Socialist Labor Party, 1876-1991: A Short History by Frank Girard and Ben Perry heard of this one too Daniel De Leon: Odyssey of an American Marxist by L. Glen Seretan I have the book on De Leon by Coleman
The Girard-Perry book has now been uploaded to https://archive.org/details/slpus-history-girard-perry and http://www.scribd.com/doc/224194985/...-Short-History
also at http://issuu.com/wirralsocialists/do...y-girard-perry