| Gloster Current Papers |
| Jack Crosby Papers |
| Harold Cranefield Papers |
| Roger Craig Papers |
| James G. Couser Papers |
| Leon Cousens Papers |
| Edward Cote Papers |
| Frank Cormier and William Eaton Papers |
| William Copeland Papers |
| Elmer Cope Papers |
| Stanley Cook Papers |
| Alexander Cook Papers |
| Concerned Unionists Records |
| Commonwealth College Records |
| Committee for National Health Insurance Records |
| Columbia Typographical Union No. 101 Records |
| Virgil Collins Papers |
| John Cole Papers |
| Ronald Cohen Papers |
| David Cohen Papers |
| Kenneth V. and Sheila M. Cockrel Papers |
| Coalition of Labor Union Women: Seattle Chapter Records |
| Coalition of Labor Union Women: San Francisco Chapter Records |
| Coalition of Black Trade Unionists Records |
| Civil Rights Congress of Michigan Records |
| Citizens for Michigan Records |
| Citizens for a United Detroit Records |
| CIO Office of the Secretary-Treasurer Records |
| CIO Washington Office Records |
| CIO Political Action Committee (PAC) Records |
