Socialist Labor party, in the United States, begun in 1877 by New York City socialists. Its membership came largely from German-American workingmen. During the 1880s a national organization was established and the party concentrated, unsuccessfully, on electoral politics. The depression conditions of the 1890s brought it renewed strength, and, under the leadership of Daniel De Leon, a Marxist revolutionary, it emphasized militant labor activities and organized (1896) its own union. After many members who opposed the leadership of De Leon withdrew (1899) and joined the less militant Social Democratic party (see Socialist party), the Socialist Labor party did not regain its previous importance.
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