| Labor unions -- Organizing -- Kentucky -- Harlan County -- History. Matches 1 item |
| Labor unions -- Organizing -- Southern States -- History. Matches 1 item |
| Labor unions -- Organizing -- United States. Matches 1 item |
| Labor unions -- Organizing -- United States -- History. Matches 1 item |
| Labor unions -- Pennsylvania -- History -- 19th century. Matches 1 item |
| Labor unions -- Pennsylvania -- History -- 20th century. Matches 1 item |
| Labor unions -- Poland. Matches 1 item |
| Labor unions -- Poland -- History -- 20th century. Matches 1 item |
| Labor unions -- Political activity -- Europe, Western -- History -- 20th century. Matches 1 item |
| Labor unions -- Political activity -- United States. Matches 1 item |