1 finding aid(s) found containing the word(s) Coal miners--Labor unions.

  1. Pinkerton's National Detective Agency records, 1853-1999

    63,000 items ; 183 containers plus 20 oversize ; 79 linear feet ; 3 microfilm reels. -- Manuscript Division, Library of Congress, Washington, D.C.

    Summary:

    Private detective agency directed by the Pinkerton family to protect interests of clients in business and industry. The records include business and family correspondence, biographical and genealogical records, administrative records such as procedural guidelines and training manuals, and criminal case files which include correspondence, reports, photographs, legal documents, and printed matter.