| Michael Hrabar Papers | Abstracts |
| Olga Hrabar Papers | Abstracts |
| Dolores Huerta Papers | Abstracts |
| Arthur Hughes Papers | Abstracts |
| William Humphreys Papers | Abstracts |
| Nicholas Hyshka Papers | Abstracts |
| Andres J. Ignasiak Papers | Abstracts |
| Illinois Labor History Society Records | Abstracts |
| Marie and David Ingar Papers | Abstracts |
| International Brotherhood of Electrical Workers (IBEW) Local 58 Records | Abstracts |
| International Longshoremen's & Warehousemen's Union Records | Abstracts |
| International Printing Pressmen Local 2 Records | Abstracts |
| International Socialists Records | Abstracts |
| Iron Molders Union, New York Records | Abstracts |
| Larry Itliong Papers | Abstracts |
| IWW Detroit/Ann Arbor Branch Records | Abstracts |
| IWW Minneapolis Branch Records | Abstracts |
| IWW San Francisco Bay Area Branch Records | Abstracts |
| Joseph Jablonower Papers | Abstracts |
| Mildred Jeffrey Papers | Abstracts |
| Newman Jeffrey Papers | Abstracts |
| Richard Jensen Papers | Abstracts |
| John Jurkanin Papers | Abstracts |
| Jack Kadish Papers | Abstracts |
| Anthony Kaiser Papers | Abstracts |
| Robert Kanter Papers | Abstracts |
| Raymond Kay Papers | Abstracts |
| William and Ann Kemsley Papers | Abstracts |
| Kenneth Forbes Papers | Abstracts |
| Charles F. Kincaid Papers | Abstracts |
| Harvey Kitzman Papers | Abstracts |
| Lucien Koch Papers | Abstracts |
| E. H. Kohlhagen Papers | Abstracts |
| Alex Kovacs Papers | Abstracts |
| Joseph J. Kowalski Papers | Abstracts |
| Jay B. Krane Papers | Abstracts |
| Dorothy Kraus Papers | Abstracts |
| Samuel Krieger Papers | Abstracts |
| Frank LaBita Papers | Abstracts |
| Labor Committee for Safe Energy and Full Employment Records | Abstracts |
| Labor Notes Records | Abstracts |
| Lloyd Lampher Papers | Abstracts |
| Layle Lane Papers | Abstracts |
| Charles Lang Papers | Abstracts |
| Milton Lapine Papers | Abstracts |
| E.W. Latchem Papers | Abstracts |
| Ben Legere Papers | Abstracts |
| Richard T. Leonard Papers | Abstracts |
| Harry E. Lester Papers | Abstracts |
| Edward Levinson Papers | Abstracts |
