Sojourner Truth Organization (STO) was active between 1969-1986 mostly in Chicago, Il. They both organized and published political education, criticism, theory, and propaganda around intersections of issues including labor, international anti-imperialism, white supremacy, and feminism. 

This collection includes the periodical Urgent Tasks, several compilations of writings put out by STO, STO public statements and more.

To explore an online archive focused exclusively on STO check out: http://www.sojournertruth.net and https://www.marxists.org/history/usa/pubs/sojournertruth/main.html