ProQuest History VaultA large database of manuscript collections relating to 19th and 20th c. U.S. history, including extensive labor records, the papers of the NAACP, CORE, SNCC, and other Civil Rights and Black Power organizations, and files regarding a wide variety of domestic affairs as well as foreign policy under the Kennedy, Johnson, and Nixon administrations. Browse to "Workers, Labor Unions, Progressives, and Radicals" for the two key, large sets of labor history collections:
Labor Unions in the U.S., 1862-1974: Knights of Labor, AFL, CIO, and AFL-CIO
Workers, Labor Unions, and the American Left in the 20th Century: Federal Records
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