A vigorous political force at the turn of the century, the largely immigrant Socialist Labor Party of America fought the abuses of America's industrial system from a Marxist platform, polling at its peak over 80,000 votes in local and state elections. This microfilm edition of the party's records, which charts in detail its changing philosophy and strategy and the influence of its most notable leaders Daniel De Leon, Hugo Vogt, Lucien Sanial and Henry Kuhn, represents a particularly rich primary research resource for both political and social historians.